assertion failures in portrait-type grids; retire an unused array in
the game generation function (my original generation strategy needed
it, but the final one didn't); correct a typo; further restrict the
generable sizes of game and include a special case for 4x4dt to
prevent a tight loop.
[originally from svn r6405]
maxflow.c. Also in this checkin, fixes to the OS X and GTK back ends
to get ALIGN_VNORMAL right. This is the first time I've used it! :-)
[originally from svn r6390]