Branch to accumulate the changes for src/games/ (not ready to pull yet)

I created this branch for myself, to accumulate the changes to src/games/. These sources were inherited from 2.11bsd tape, and they need some cleanup to be compiled by gcc. I continue to work on them at a slow pace. Still ten games to fix: boggle, btlgammon, cribbage, fortune, hangman, mille, monep, quiz, robots and snake. When all done, the branch can be merged into mainstream.