New formula: pplatex

I have added a formula for `pplatex`.


>LaTeX is known to produce really nice document layouts. But it is also known to produce quite some line noise on the command line. This tool parses the log-output of latex and pdflatex and prints only warnings and errors in an humanely readable format.
>The code is based on the LaTeX output parser of Kile (also used by TexMakerX), with some modifications and bugfixes.