Merge branch 'bug30649_040' into bug30649_maint_041

changes/doc30630

+  o Documentation:
+    - Mention URLs for Travis/Appveyor/Jenkins in ReleasingTor.md. Closes
+      ticket 30630.

changes/feature28976

-  o Minor features (developer tooling):
-    - Provide a git pre-commit hook that disallows commiting if we have any
-      failures in our code and changelog formatting checks. It is now available
-      in scripts/maint/pre-commit.git-hook. Implements feature 28976.

changes/geoip-2019-02-05

-  o Minor features (geoip):
-    - Update geoip and geoip6 to the February 5 2019 Maxmind GeoLite2
-      Country database. Closes ticket 29478.
-

changes/geoip-2019-03-04

-  o Minor features (geoip):
-    - Update geoip and geoip6 to the March 4 2019 Maxmind GeoLite2
-      Country database. Closes ticket 29666.
-

changes/geoip-2019-04-02

-  o Minor features (geoip):
-    - Update geoip and geoip6 to the April 2 2019 Maxmind GeoLite2
-      Country database. Closes ticket 29992.
-

changes/geoip-2019-05-13

-  o Minor features (geoip):
-    - Update geoip and geoip6 to the May 13 2019 Maxmind GeoLite2
-      Country database. Closes ticket 30522.
-

changes/ticket21377

-  o Minor features (dircache):
-    - When a directory authority is using a bandwidth file to obtain the
-      bandwidth values that will be included in the next vote, serve this
-      bandwidth file at /tor/status-vote/next/bandwidth. Closes ticket 21377.
\ No newline at end of file

changes/ticket26698

-  o Minor features (directory authority):
-    - When a directory authority is using a bandwidth file to obtain the
-      bandwidth values, include the digest of the file in the vote.
-      Closes ticket 26698.

changes/ticket27761

-  o Minor features (changelogs):
-    - Check that bugfix versions in changes files look like Tor versions
-      from the versions spec. Warn when bugfixes claim to be on a future
-      release. Closes ticket 27761.

changes/ticket28614

-  o Major bugfixes (windows, startup):
-    - When writing a consensus file to disk, always write in
-      "binary" mode so that we can safely map it into memory later.
-      Fixes part of bug 28614; bugfix on 0.4.0.1-alpha.
-    - When reading a consensus file from disk, detect whether it
-      was written in text mode, and re-read it in text mode if so.
-      Fixes part of bug 28614; bugfix on 0.4.0.1-alpha.
-

changes/ticket28668

-  o Minor features (testing):
-    - Treat all unexpected ERR and BUG messages as test failures.
-      Closes ticket 28668.

changes/ticket28816

-  o Code simplification and refactoring:
-    - Introduce a connection_dir_buf_add() helper function that checks for
-      compress_state of dir_connection_t and automatically writes a string to
-      directory connection with or without compression. Resolves issue 28816.

changes/ticket29026

-  o Minor features (compilation):
-    - Compile correctly when OpenSSL is built with engine support
-      disabled, or with deprecated APIs disabled. Closes ticket
-      29026. Patches from "Mangix".

changes/ticket29072

-  o Removed features:
-    - Remove check-tor script from repository. Resolves issue 29072.

changes/ticket29160

-  o Minor bugfixes (tests):
-    - Do not log an error-level message if we fail to find an IPv6
-      network interface from the unit tests. Fixes bug 29160; bugfix on
-      0.2.7.3-rc.

changes/ticket29168

-  o Major bugfixes (cell scheduler, KIST):
-    - Make KIST to always take into account the outbuf length when computing
-      what we can actually put in the outbuf. This could lead to the outbuf
-      being filled up and thus a possible memory DoS vector. TROVE-2019-001.
-      Fixes bug 29168; bugfix on 0.3.2.1-alpha.

changes/ticket29357

-  o Minor features (dormant mode):
-    - Add a DormantCanceledByStartup option to tell Tor that it should
-      treat a startup event as cancelling any previous dormant state.
-      Integrators should use this option with caution: it should
-      only be used if Tor is being started because of something that the
-      user did, and not if Tor is being automatically started in the
-      background. Closes ticket 29357.

changes/ticket29435

-  o Minor bugfixes (testing):
-    - Fix our gcov wrapper script to look for object files at the
-      correct locations. Fixes bug 29435; bugfix on 0.3.5.1-alpha.

changes/ticket29631

-  o Minor bugfixes (Rust, protover):
-    - The Rust implementation of protover was missing the "Padding" value in
-      the translate function from C to Rust. Fixes bug 29631; bugfix on
-      0.4.0.1-alpha.

changes/ticket29702

-  o Testing:
-    - Specify torrc paths (with empty files) when launching tor in
-      integration tests; refrain from reading user and system torrcs.
-      Resolves issue 29702.