Log Message:
-take maintainership (as suggested by snj)
-update to 2.4.1
changes:
- PrBoom demos are now recorded with high-precision turning (like the
  "Doom v1.91" hack that is floating around)
- when both -nodraw and -nosound are supplied, then no graphics will be
  initialized and no windows opened
- add ultdoom compatibility level, and bring compatibility levels into line
  with Prboom+
- screenshots now use correct palette in software mode
- screenshots now in PNG format on Linux/Unix where available
- suppress use-supershotgun key in compatibility mode
- removed obsolete video related code
- fix screenshots on 64bit systems
- fix comp_666