General cleanups patch from James H:

General cleanups patch from James H:
 - missing static in filling.c
 - better robustness in execute_move() in filling.c
 - remove side effects in assert statements
 - remove rogue diagnostic in galaxies.c
 - remove // comment in map.c
 - add more stylus-friendly UI to Pattern
 - bias Unequal towards generating inequality clues rather than numeric

[originally from svn r7344]