* Avoid using python-support. Closes: #525086
* websetup: Display stderr in browser if ikiwiki setup fails.
* blogspam: Load RPC::XML library in checkconfig, so that an error
can be printed at that point if it's not available, allowing
the admin to see it during wiki setup. Closes: #520015
* websetup: If setup fails, restore old setup file.
* relativedate: Deal with clock skew.
* Add IkiWiki::ErrorReason objects, and modify pagespecs to return
them in cases where they fail to match due to a configuration
or syntax error.
* pagespec_match_list: New API function, matches pages in a list
and throws an error if the pagespec is bad.
* inline, brokenlinks, calendar, linkmap, map, orphans, pagecount,
pagestate, postsparkline: Display a handy error message if the
pagespec is erronious [sic].
* comments: Add link to comment post form to allow user to sign in
if they wish to, if the configuration makes signin optional for
commenting.
* Updated Danish translation from Jonas Smedegaard. Closes: #525751
* translation.mdwn: Typo fixes. Closes: #525753
Add msgfmt to USE_TOOLS (it's called at the end of the build).
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