Log Message:
Update to 0.31:

        0.31 release.  Code cleanups and bug fixes.

        New features:

        - If multiple --message (or -m) arguments are passed to
          'commit', then they will be concatenated on separate lines.

        - The validate_commit_message hook is now told what branch the
          commit is on.

        Bugs fixed:

        - The typo that prevented building with gcc 3.3 has been
          fixed.

        - Attempting to commit without a signing key available now
          fails earlier.

        - Command-line option parsing has been redone yet again; this
          should fix a number of bugs caused by the use of
          boost::program_options.  For instance, command line error
          messages are now l10nized again, "--depth=asdf" now gives a
          sensible error message instead of crashing, and --key= now
          works as an alternative to -k "".

        - A bug in the new roster caching logic that caused assertion
          failures on very large trees has been fixed.

        - A rare bug in the "epoch refinement" phase of the netsync
          protocol has been fixed.

        - Accidental (and undocumented) change to 'automate inventory'
          output format reverted; documentation is now correct again.

        - Some obscure error conditions with 'pivot_root' fixed.

        Many fixes to 'automate stdio':

        - IO handling has been rewritten, to remove some
          obscure bugs and clean up the code.

        - automate commands can now take options (even when used with
          'automate stdio').

        - The default block size has been increased to 32k (which
          should considerably reduce overhead).

        - Many automate commands were flushing their output far too
          often, causing major slowdowns when used with 'automate
          stdio'; this has been fixed.

        - Syntax errors now cause 'automate stdio' to exit, rather
          than attempting to provide usage information for the calling
          program to read.

        Other:

        - New large-coverage random testsuite for delta reconstruction
          path finding algorithm.

        - Miscellaneous code cleanups and improved error messages.

        - Enhancements to debian packaging.

        - New translation to es (Spanish).