Added an automatic `Solve' feature to most games. This is useful for
various things:
- if you haven't fully understood what a game is about, it gives
you an immediate example of a puzzle plus its solution so you can
understand it
- in some games it's useful to compare your solution with the real
one and see where you made a mistake
- in the rearrangement games (Fifteen, Sixteen, Twiddle) it's handy
to be able to get your hands on a pristine grid quickly so you
can practise or experiment with manoeuvres on it
- it provides a good way of debugging the games if you think you've
encountered an unsolvable grid!
git-svn-id: svn://svn.tartarus.org/sgt/puzzles@5731
cda61777-01e9-0310-a592-
d414129be87e