Reassign databases/ perl modules to perl@.

Also:

• Sort plists
• Sort DEPENDS
• Add TEST_DEPENDS where necessary
• p5-Class-DBI-DDL: switch to USE_PERL5=configure
• Remove unnecessary or unusual stuff from pkg-descr's
• Regenerate patches using makepatch where necessary
• Based on the description from p5-DBIx-Password (most of which I've excised), it isn't clear whether this module even works when it's built non-interactive
• p5-DBIx-Simple: Make all the OPTIONS dependencies BUILD_DEPENDS as well
• p5-T2: Fails 'make test' (as it did before). The module isn't even present on CPAN or Meta::CPAN, and should probably be considered for deletion