localrepo: add desc parameter to transaction All callers to localrepo.transaction() must supply a transaction description. The description and the existing repository tip are then stored (transactionally) into .hg/undo.desc; where rollback can later find it.

merge with stable

merge default

test-hgwebdir: correctly include '-' in sed expression. '\' can't be used to escape '-' from being interpreted as a range, so put it at the end.