- clarified wording of messages in validate_params(), including in
particular a correction from `< 255' to `<= 255'
- fixed random_upto() in game generation which caused the maximum
number of balls never to be used when there was uncertainty
- fixed widespread miscalculation of rectangular-array indices
(multiplication by h instead of w, which would have broken
non-square grids rather profoundly)
- corrected an ANSI namespace violation
- removed real functionality from the inside of assert()
statements, so that the game should still work when compiled
-DNDEBUG
- couple of unnecessary linear-time loops removed.
[originally from svn r6149]
