Update overlay

- Add bless-0.6.0-r1 ebuild with support of the new unified
  dev-dotnet/gtk-sharp and newer mono.

- Add nvidia-cuda-toolkit-5.5.22 build, removing the ncurses[tinfo]
  dependency, since it doesn't seem necessary and brings a ton of
  breakages.

- Add wxMEdit-2.9.6.2 ebuild.

- Update stockfish ebuild to stockfish-dd (4_pre20131129).