Add branchtags function with cache - cache stores tipmost node and rev and node,label pairs - if cache is out of date, scan new changesets - write new cache out after scan

Update branch on checkout/update

Report branch for hg id

Report branch for hg log and friends

Add branch method to contexts

imported patch b1

add footer to old style

fix rss template

Fixed page overlap for file revision links in hgweb. This is another step to fix issue189, but currently the file revision numbers are read as changeset revision numbers, so the link will point to the wrong revision.

merge with main