nikoli.co.jp (which has quite a few puzzles that they don't seem to
have bothered to translate into English).
Minor structural change: the disjoint set forest code used in the
Net solver has come in handy again, so I've moved it out into its
own module dsf.c.
[originally from svn r6155]
puzzle, to make it construcct puzzle IDs and output them on stdout.
Also checked in print.py, a script which reads puzzle IDs on stdin
and produces PostScript output. With these, you can generate pages
of Pattern, Rectangles and Solo puzzles to take on trains with you.
[originally from svn r5707]
