reimplment t/tml in perl

This is an approximation of the original bash t/tml program.  It
uses regular expressions instead of globs, but the end result
seems pretty similar.

Documention is in POD.
start splitting local tests up by spec topics
split nullref tests by data type
split 03_regression by data type
make tml file names singular
merge nesting.tml into collection.tml
split 02_basic by data_type