modules/partdisks: ensure we disable relevant LUKS devices *directly* when the user decides to do so.

This permits the removal of the check in Apply(), where an eventual LUKS device is disabled if the
containing hard drive is touched.
As a bonus, the user sees directly what it happens on dependant Volume Groups.
modules/partdisks: front/glade: do not show (former?) distribution name in changed partitions.
Merge branch 'master' into debian
5.0.4-1