plot_files can not plot each on a separate plot
added operator translator, to make names on plots nicer
improvements to level translator.

Should get all irreps right now
Should handle mometum 2
make plot_files use subplot rather than plot2grid

Seems to have performance improvements
Allows tight_layout to work
translate names when used in level_identifier
better xlabels
prune iso* not just isotriplet
level_identifier now uses subplot instead of sub2grid