Galaxies: skew grid generation in favour of wiggliness.

Ben complained yesterday that Galaxies had a nasty habit of generating
games whose solution was a boring set of rectangles. Now that even at
Normal mode the solver is better at coping with wiggly tentacled
regions, it seems like a good moment to fix that.

This change arranges that when we initially generate a filled grid, we
try ten times, and pick the wiggliest of the grids we found. This
doesn't make any boring rectangle-filled grid _impossible_ - players
will still have to stay on their toes, and can't rely 100% on at least
a certain number of wiggles existing - but it makes the interesting
grids a lot more likely to come up.

This skew happens before checking solubility. So it doesn't increase
grid generation time by a factor of ten (as it would if we generated
ten _soluble_ grids and picked the wiggliest). It's still a speed
drop, of course, but a more modest one than that.

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