git: implement date_parse method

Users are expected to be familiar with git's "approxidate"
functionality for parsing dates, so we'll expose that
in our UIs.  Xapian itself has limited date parsing functionality
and I can't expect users to learn it.

This takes around 4-5ms on my aging workstation, so it'll
probably be made acceptable for the WWW UI, even.

libgit2 has a git__date_parse function which I expect to have
less overhead, but it's only for internal use at the moment.

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