consistently don't list or number tables without a caption

[chrisfenner]

There was a bug in the "should we not number this table" logic:

• The use of caption and caption* (controls links in list of tables) wasn't always consistent with the \addtocounter{table}{-1} workaround (undoes the incrementation of the counter)
• As a result, many tables that shouldn't have been numbered (in the TPM spec) were getting numbered

This change updates the logic to be more clear:

A table is not numbered, and not included in the list of tables, if:

• .unnumbered .unlisted (traditional way to omit stuff from the TOC) OR
• there is no caption

Edge case corollary: a table that is .unnumbered .unlisted should not be cross-referenced.

Fixes #194