hggtk/gdialog: handle empty cmd.differ entries in hgrc like hg does
remove uses of revlog.count() and repo.workingctx()
hggtk/changeset: fix gitmode()
hggtk/status: revert needs '' as empty --rev
hggtk/status: fix inclusion of unknown files
hggtk/datamine: only allow following copies when no includes/excludes
merge with default
hggtk/commit: fix use of changelog.count()