[PATCH 2 of 2] remove: add progress support

[Anton Shestakov]

18.03.2016, 05:22, "timeless" <timeless at mozdev.org>:

> + ui.progress(_('deleting'), count, total=total, unit=_('subrepo'))

Please put unit in plural form here and below, i.e. 'subrepos', 'files'. This way it's going to be consistent with other progress units, and look better in places like "1/3 files".