Make sure that moves in Flood use only valid colours

If execute_move() receieves a move that uses a colour beyond the range
for the current game, it now rejects it.  Without this a solve string
containing an invalid colour would cause an assertion failure: "fill:
Assertion `oldcolour != newcolour' failed."  While I was in the area I
put a range check on colours for normal moves as well.  To demonstrate
the problem, load this save file:

SAVEFILE:41:Simon Tatham's Portable Puzzle Collection
VERSION :1:1
GAME    :5:Flood
PARAMS  :7:6x6c6m5
CPARAMS :7:6x6c6m3
DESC    :39:432242034203340350204502505323231342,17
NSTATES :1:2
STATEPOS:1:2
MOVE    :2:S6

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