Really fix the PS alignment issues with mathtex.
Rename _mathtext_data.py to _font_data.py and remove unused tables from it.
Remove mathtext.py from matplotlib and fix a bug in the OS X backend.
Port the OS X backend over. I am unable to test this at the current time.
Remove the mathtext include from the Qt3 backend.
Fix the alignment issues with the PS backend.
No need to import mathtex in the Qt4 backend.
Port parts of the PS backend over. Alignment still needs to be checked.
Port over the Cairo backend to mathtex. Just PS and OS X left.
Port the SVG backend over to mathtex.
