multiple MathParser warnings and issues

[NemesMarcus]

I 've run LaTeXML 0.8.8 with ~16k formulae and collected/categorized my findings (and simplified the formulae as far as I could) in the

mathparser.tex

with some comments about the issues in the *.tex.

In my opinion, most of the issues are unnecessary "not_parsed" warnings (from the naive user's viewpoint, as the html rendering looks good, so contrary to the warning everything should have been parsed?). A few of them I consider an error, see the %ERROR marks in the mathparser.tex I added the pdflatex PDF output for comparison too.

On the other hand, a handful of correct warnings were also issued during the test by the semantic parser for *.tex issues which are not found by pdflatex (like missing closing parentheses, missed by multiple proof readings), so kudos for that.

mathparser.zip