Add Test::Pod Test::CPAN::Meta Test::MinimumVersion Test::Perl::Critic

Make minimal work for null symbols.

Forbid both MAXIMAL & MINIMAL setting on rules & symbols.

Eliminate internal priority?
    If so, rename user priority to PRIORITY.

Add ah_minimal.t -- ah2.t with minimal set on the grammar

Add optimizations when max_parses <= 1
    For example, no need to prune duplicate parses

Ensure -ENV is not on for smart comments when I leave alpha

Should or_map's be hashes instead of array?  How many duplicate
entries are there and what's the cost?
