Address U. F. O. shortcomings.

This attempts to address a number of issues mentioned in #1653, specifically the dropping of version data, the changing of glif names, and the reversal of reference and anchor orders. It also enables layered U. F. O. output in certain limited contexts outside of the specification.

The U. F. O. fake reference glyphs are created with zero layers. If one has more layers than that (as was happening before I fixed something else), there is something wrong.