dependencies, as specified in blueprint "improved-version-matching".
It's possible now to require greater, greater or equal than,
less, less or equal than, and equal pkg versions, as well as using
'{}' and '[^!]' csh patterns in dependencies.
Code lifted from FreeBSD, thanks! :-)
Change XBPS_RELVER to 20091107 to match latest additions.
--HG--
extra : convert_revision : xtraeme%40gmail.com-20091107035620-3051wcwrirqn2g14
