Merge pull request #51 from mpickering/master

Reorganisation
Renamed modules & functions producing TeX:  TeXMath -> TeX.
omml2docx: small improvement.
omml2docx improvements.

Now a docx name is required as first argument, and multiple omml
files can be specified.
MathML Reader: Fixed bug which caused output to be duplicated
MathML Reader: Added basic recognition of accentunder
Regen tests