Better PAR correction

Better PAR correction

PAR correction so far merely applied a horizontal scaling factor to
glyphs right after loading. This screws up transformed text,
unfortunately.
It's a much better approach to typeset text without correction and scale
everything at the very end. In MPlayer, an EOSD rendering now looks
exactly the same as a video filter rendering (except for more sharpness
in the EOSD case).