Untangle: turn #define VERTEX_NUMBERS into a preference.

This compile-time definition switches the game into showing a distinct
non-negative integer for each vertex, instead of indistinguishable
blobs.

Its main use to me in the past has been when I'm trying to planarise
'real' graphs, that is, graphs I got from outside the game and wanted
a planar embedding of. Having made one in Untangle's UI I could then
read off which vertex was which.

That's an unusual use of the game, but _might_ be useful to someone
else. Perhaps a more interesting use of this feature would be to
direct someone else's play verbally - it would be much easier to tell
them which vertex to click on that way!

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