Backed out of the "stacked labels" test from previous release

My understanding of the "stacked labels" change in 5.14.0 was obviously wrong,
and I broke Test::MinimumVersion. I don't fully understand all aspects of this
right now, but backing out to sort out the breakage.
Was comparing versions a non-portable way

This is probably a temp fix. Second time bitten by this, really need to understand
this better.
Added mention of perlver to DESCRIPTION and SEE ALSO
Mention Perl::MinimumVersion::Fast in SEE ALSO