hgweb: minor improvements for new web style
- make renamelink take a context
- pass current node to shortlog page rather than tip
- pass user/desc/date/rename to filediff
- improve template error reporting for foo%bar
import doctest
import mercurial.changelog
# test doctest from changelog
doctest.testmod(mercurial.changelog)
import mercurial.httprepo
doctest.testmod(mercurial.httprepo)
import mercurial.util
doctest.testmod(mercurial.util)