Detected by Lintian's hyphen-used-as-minus-sign check.

when=XXX did work already. This patch allow to write this with spaces around the
equal sign - as in every other backup.d/ file.

Thanks to Olivier Berger for the patch.

cut is in /usr/bin actually.

Now that there's some removal of increments for old fulls, we can keep fulls for a longer time, for instance 1Y which becomes default

Conflicts:
	AUTHORS
	ChangeLog

Thanks to Ian Beckwith for the patch.

Thanks to Sergio Talens-Oliag <sto@debian.org> for the bug report and patch.