add a blurb for 0.2.3.18-rc, other minor cleanups

Changes in version 0.2.3.18-rc - 2012-06-28

  Tor 0.2.3.18-rc is the first release candidate for the Tor 0.2.3.x

  series. It fixes a few smaller bugs, but generally appears stable.

  Please test it and let us know whether it is!

  o Major bugfixes:

    - Allow wildcarded mapaddress targets to be specified on the

      upload", so that they no longer confusingly imply that we're

      sending something to a directory we might not even be connected

      to yet. Fixes bug 3311; bugfix on 0.2.0.10-alpha.

    - Make sure to set *socket_error in all error cases in

      connection_connect(), so it can't produce a warning about

      errno being zero from errno_to_orconn_end_reason(). Bugfix on

      0.2.1.1-alpha; resolves ticket 6028.

    - Downgrade "Got a certificate, but we already have it" log messages

      from warning to info, except when we're a dirauth. Fixes bug 5238;

      bugfix on 0.2.1.7-alpha.

      Fixes bug 5932; bugfix on 0.2.2.7-alpha.

  o Minor bugfixes (on 0.2.3.x):

    - Make format_helper_exit_status() avoid unnecessary space padding

      and stop confusing log_from_pipe(). Fixes ticket 5557; bugfix

      on 0.2.3.1-alpha.

    - Downgrade a message about cleaning the microdescriptor cache to

      "info" from "notice". Fixes bug 6238; bugfix on 0.2.3.1-alpha.

    - Improve log message issued when a managed proxy fails to

      launch. Fixes bug 5099; bugfix on 0.2.3.6-alpha.

    - Log a BUG message at severity INFO if we have a networkstatus with

      a missing entry for some microdescriptor. Continues on a patch

      to 0.2.3.2-alpha.

    - Improve the log message when a managed proxy fails to launch. Fixes

      bug 5099; bugfix on 0.2.3.6-alpha.

    - Don't do DNS lookups when parsing corrupted managed proxy protocol

      messages. Fixes bug 6226; bugfix on 0.2.3.6-alpha.

    - When formatting wildcarded address mappings for the controller,

      bugfix on 0.2.3.9-alpha.

    - Avoid a warning caused by using strcspn() from glibc with clang 3.0.

      Bugfix on 0.2.3.13-alpha.

    - Make format_helper_exit_status() avoid unnecessary space padding and

      stop confusing log_from_pipe(). Fixes ticket 5557.

    - Make sure to set *socket_error in all error cases in

      connection_connect(), so it can't produce a warning about errno

      being zero from errno_to_orconn_end_reason(). Resolves ticket 6028.

    - Remove non-bug log messages about running with circuit timeout

      learning enabled from LD_BUG. Fixes bug 6169; bugfix on

      0.2.3.17-beta.

    - Stop logging messages about running with circuit timeout learning

      enabled at severity LD_BUG. Fixes bug 6169; bugfix on 0.2.3.17-beta.

    - Disable a spurious warning about reading on a marked and flushing

      connection. We shouldn't be doing that, but apparently we

      sometimes do. Fixes bug 6203; bugfix on 0.2.3.17-beta.

    - Fix a bug that stopped AllowDotExit from working on addresses

      that had an entry in the DNS cache. Fixes bug 6211; bugfix on

      0.2.3.17-beta.

    - Log a BUG message at INFO if we have a networkstatus with a missing

      entry for some microdescriptor.

  o Code simplification, refactoring, unit tests:

    - Move tor_gettimeofday_cached() into compat_libevent.c, and use

}

/** Helper: return the number of characters in <b>s</b> preceding the first

 * occurence of <b>ch</b>. If <b>ch</b> does not occur in <b>s</b>, return

 * occurrence of <b>ch</b>. If <b>ch</b> does not occur in <b>s</b>, return

 * the length of <b>s</b>. Should be equivalent to strspn(s, "ch"). */

static INLINE size_t

str_num_before(const char *s, char ch)