rebase: do not try to reactivate deleted divergent bookmark
If the currently active bookmark is divergent one, it may be resolved during
rebase. Trying to activate it will raise "KeyError: 'W@diverge'".
Lucas Moscovicz <lmoscovicz@fb.com> [Mon, 10 Feb 2014 17:38:43 -0800] rev 20521
revset: changed spanset implementation to take hidden revisions into account
Hidden revisions are now excluded from the spanset.
Now this doesn't break for people using changeset evolution.