Fix re: and glob: patterns in .hgignore (reported by Brad Schick)
relglob: and relre: were already detected for a long time, so
I kept this undocumented functionality, especially as it was already
tested in test-hgignore.
%% Should show unknown
? unknown
removing b
%% Should show unknown and b removed
R b
? unknown
%% Should show a and unknown
a
unknown