revset: fix a crash in parents() when 'wdir()' is in the set The crash was "TypeError: expected string or Unicode object, NoneType found" down in revlog.parentrevs(). This fixes heads() too (which is where I found it.)

workingctx: don't report the tags for its parents This fixes the bad distance calculation for '{latesttagdistance}' mentioned in the previous patch.

hgweb: don't try to show repo on repo-not-found page in monoblue

hgweb: fix help pages title in gitweb and monoblue Help pages in gitweb and monoblue were setting a completely inappropriate title: "Branches". Let's have a proper title (copy-pasted from paper style).

hgweb: don't show summary link as active on error pages in monoblue These two error pages in monoblue think they are the summary page, when they clearly aren't.

identify: build the tag list directly instead of using wctx.tags() The current implementation of workingctx.tags() returns the tags of the parents. This causes the calculation of {lastesttagdistance} from wdir() to be wrong. The value when updated to a tag is 0, but updated to the tag's child is 2, the child of that 3, and so on. This prepares for workingctx.tags() to not report the parent tags.

identify: avoid a crash when given '-r wdir()' The crash was 'NoneType is not subscriptable' in hexfunc(ctx.node()), because the node for wdir() is None. This can be avoided simply by detecting 'wdir()' and taking the existing path for no given revision.