edges and the bottom/right ones. Fix it. (Also remove it from the
todo list in osx.m, where I had entered it in the assumption that it
was a bug in my new OS X port! Turns out it's an entirely platform-
independent bug.)
[originally from svn r5187]
functions and a couple of variables, now each one exports a single
structure containing a load of function pointers and said variables.
This should make it easy to support platforms on which it's sensible
to compile all the puzzles into a single monolithic application. The
two existing platforms are still one-binary-per-game.
[originally from svn r5126]
