only take doubled VERTBAR if each one is SINGLE
make space in math be only half em; make big operators git size Big; correct the Unicode for \uplus and \biguplus
translate border to proper classes; disable stretchy if size is set; recognize SUMOP,INTOP as largeop and also set symmtric
Merge branch 'master' of github.com:brucemiller/LaTeXML
parsing of fake math was affected by change in width of space