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
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
created new head
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)