added DigestText that digests material in text mode
give more space for equation numbers; right align right equation numbers
Add ltx:tag as optional 1st element to equations, so can have formatted numbers
use ltx:tag for equation number, if present
Merge branch 'master' of github.com:brucemiller/LaTeXML
tweaked item tag style to get right aligned
extracted isDefinable from \@ifdefinable and used it in \newcomand, et.al
use new isDefinable