mq: rename strip --nobackup option to --no-backup (
issue2377)
Same option name as for hg revert --no-backup.
Deprecate strip --nobackup.
color: add win32 support for non-black background
This complicates the code a bit, since attributes need to be masked together
correctly before they are applied. Perhaps the code should be redesigned at
some point, but this works well for now.