pointless 0.5 released

This release contains a large number of fixes (including fixes for a few crashbugs and for serious problems with fullscreen support). A number of new features has been added as well: tables, scaling of pll-embedded content (like LaTeX or Metapost), pll-to-tgz packing etc. It should also be mentioned that pointless no longer uses python embedded but has become a plain python extension. Finally pointless now uses far less memory and cpu cycles.