Remove changes files that we have folded in

changes/18640

-  o Major features (resource management):
-    - Tor now includes support for noticing when we are about to run out of
-      sockets, and preemptively closing connections of lower priority.
-      (This feature is off by default for now, since the current prioritizing
-      method is not mature enough yet. You can enable it by setting
-      "DisableOOSCheck 0".) Closes ticket 18640.

changes/19122

-  o Minor bugfixes (documentation):
-    - Fix manual for the User option: it takes a username, not a UID.
-      Fixes bug 19122; bugfix on 0.0.2pre16 (the first version to have
-      a manpage!).

changes/19977

-  o Minor bugfixes (unit tests):
-    - Fix shared random unit test that was failing on big endian architecture
-      due to internal representation of a integer copied to a buffer. The test
-      is changed to take a full 32 bytes of data and use the output of a
-      python script that make the COMMIT and REVEAL calculation according to
-      the spec.  Fixes bug 19977; bugfix on tor-0.2.9.1-alpha.

changes/bug19677

-  o Minor bugfixes (option parsing):
-    - Count unix sockets when counting client listeners (SOCKS, Trans,
-      NATD, and DNS). This has no user-visible behaviour changes: these
-      options are set once, and never read.
-      Required for correct behaviour in ticket 17178.
-      Fixes bug 19677; bugfix on 0.2.6.3-alpha.  Patch by teor.

changes/bug19767

-  o Minor bugfixes (compilation):
-    - Always include orconfig.h before including any other C headers.
-      Sometimes, it includes macros that affect the behavior of the
-      standard headers. Fixes bug 19767; bugfix on 0.2.9.1-alpha (the first
-      version to use AC_USE_SYSTEM_EXTENSIONS).
-

changes/bug19902

-  o Major bugfixes (compilation, OpenBSD):
-
-    - Fix a Libevent-detection bug in our autoconf script that would
-      prevent Tor from linking successfully on OpenBSD. Patch from
-      rubiate. Fixes bug 19902; bugfix on 0.2.9.1-alpha.

changes/bug19905

-  o Minor bugfixes (IPv6, testing):
-    - Check for IPv6 correctly on Linux when running test networks.
-      Fixes bug 19905; bugfix on 0.2.7.3-rc; patch by teor.

changes/bug19964

-  o Minor bugfixes (logging):
-    - When we are unable to remove the bw_accounting file, do not warn
-      if the reason we couldn't remove it was that it didn't exist.
-      Fixes bug 19964; bugfix on 0.2.5.4-alpha. Patch
-      from 'pastly'.
-

changes/bug19998

-  o Minor features (security, TLS):
-    - Servers no longer support clients that do not provide AES
-      ciphersuites. (3DES is no longer considered an acceptable
-      cipher.) We believe that no such clients currently exist,
-      since we have required OpenSSL 0.9.7 or later since 2009.
-      Closes ticket 19998.

changes/bug19999_prep

-  o Minor features (unit tests):
-    - The unit tests now log all warning messages with the "BUG" flag.
-      Previously, they only logged errors by default. This change will
-      help us make our testing code more correct, and make sure that
-      we only hit this code when we mean to. This is preparatory work
-      for ticket 19999.
-    - Our unit testing code that captures log messages no longer prevents
-      them from being written out if the user asked for them (by passing
-      --debug or --info or or --notice --warn to the "test" binary). This
-      change will prevent us from missing unexpected log messages simply
-      because we were looking for others. Related to ticket 19999.
-    - Our link-handshake unit tests now check, that when invalid
-      handshakes fail, they fail with the error messages we
-      expected.
-    - The unit tests now treat any failure of a "tor_assert_nonfatal()"
-      assertion as a test failure.
-
-  o Minor bugfixes (unit tests):
-    - The tor_tls_server_info_callback unit test no longer crashes when
-      debug-level logging is turned on. Fixes bug 20041; bugfix on
-      0.2.8.1-alpha.
-

changes/bug20012

-  o Major bugfixes (hidden services):
-    - Clients require hidden services to include the TAP keys
-      for their intro points in the hidden service descriptor.
-      This prevents an inadvertent upgrade to ntor, which a
-      malicious hidden service could use to discover which
-      consensus a client has.
-      Fixes bug 20012; bugfix on 0.2.4.8-alpha. Patch by teor.
-  o Minor bugfixes (hidden services):
-    - Stop logging intro point details to the client log on
-      certain error conditions.
-      Fixed as part of bug 20012; bugfix on 0.2.4.8-alpha.
-      Patch by teor.

changes/bug20063

-  o Minor bugfixes (Linux seccomp2 sandbox):
-    - Add permission to run the sched_yield() and sigaltstack() system
-      calls, in order to support versions of Tor compiled with
-      asan or ubsan code that use these calls. Now "sandbox 1" and
-      "--enable-expensive-hardening" should be compatible.
-      Fixes bug 20063; bugfix on 0.2.5.1-alpha.

changes/bug20064

-  o Minor bugfixes (Directory Authority):
-   - When allowing private addresses, mark Exits that only exit to
-     private locations as such. Fixes bug 20064; bugfix on
-     0.2.2.9-alpha.
-

changes/bug20065

-  o Minor bugfixes (directory authorities):
-    - Die with a useful error when the operator forgets to place the
-      authority_signing_key file into the keys directory. This avoids an
-      uninformative assert & traceback about having an invalid key.
-      Fixes bug 20065; bugfix on 0.2.0.1-alpha.

changes/bug20081

-  o Minor bugfixes (allocation):
-    - Change how we allocate memory for large chunks on buffers, to avoid
-      a (currently impossible) integer overflow, and to waste less space
-      when allocating unusually large chunks. Fixes bug 20081; bugfix on
-      0.2.0.16-alpha. Issue identified by Guido Vranken.

changes/bug20093

-  o Minor bugfixes (logging):
-    - When logging a message from the BUG() macro, be explicit about what
-      we were asserting. Previously we were confusing what we were asserting
-      with what the bug was. Fixes bug 20093; bugfix on 0.2.9.1-alpha.

changes/bug20110

-  o Minor bugfixes (compilation):
-
-    - Stop trying to build with Clang 4.0's -Wthread-safety
-      warnings. They apparently require a set of annotations that we
-      aren't currently using, and they create false positives in our
-      pthreads wrappers. Fixes bug 20110; bugfix on 0.2.9.1-alpha.

changes/bug20117

-  o Minor bugfixes (documentation):
-    - Document the default PathsNeededToBuildCircuits value that's
-      used by clients when the directory authorities don't set
-      min_paths_for_circs_pct.
-      Fixes bug 20117; bugfix on 02c320916e02 in tor-0.2.4.10-alpha.
-      Patch by teor, reported by Jesse V.

changes/bug20141

-  o Minor bugfixes (compilation):
-    - Fix a syntax error in the IF_BUG_ONCE__() macro in non-
-      GCC-compatible compilers. Fixes bug 20141; bugfix on
-      0.2.9.1-alpha. Patch from Gisle Vanem.

changes/feature17178

-  o Major features (onion services):
-    - Add experimental HiddenServiceSingleHopMode and
-      HiddenServiceNonAnonymousMode options. When both are set to 1, every
-      hidden service on a tor instance becomes a non-anonymous Single Onion
-      Service. Single Onions make one-hop (direct) connections to their
-      introduction and renzedvous points. One-hop circuits make Single Onion
-      servers easily locatable, but clients remain location-anonymous.
-      This is compatible with the existing hidden service implementation, and
-      works on the current tor network without any changes to older relays or
-      clients.
-      Implements proposal 260, completes ticket 17178. Patch by teor and asn.
-  o Minor features (Tor2web):
-    - Make Tor2web clients respect ReachableAddresses.
-      This feature was inadvertently enabled in 0.2.8.6, then removed
-      by bugfix 19973 on 0.2.8.7.
-      Implements feature 20034. Patch by teor.
-  o Minor bug fixes (Tor2web):
-    - Prevent Tor2web clients running hidden services, these services are
-      not anonymous due to the one-hop client paths.
-      Fixes bug 19678. Patch by teor.
-  o Minor bug fixes (circuits):
-    - Use CircuitBuildTimeout whenever LearnCircuitBuildTimeout is disabled.
-      Fixes bug 19678; bugfix on commit 5b0b51ca3 in 0.2.4.12-alpha. Patch by teor.
-  o Minor bug fixes (options):
-    - Stop changing the configured value of UseEntryGuards on authorities
-      and Tor2web clients.
-      Fixes bug 20074; bugfix on commits 51fc6799 in tor-0.1.1.16-rc and
-      acda1735 in tor-0.2.4.3-alpha. Patch by teor.
-    - Check the consistency of UseEntryGuards and EntryNodes more reliably.
-      Fixes bug 20074; bugfix on commit 686aaa5c in tor-0.2.4.12-alpha. Patch by teor.