Adds a range check for Utilities>>floatPrcisionForDecimalPlaces: and a
default implementation that works when the parameter is out of range.

Implementation note:
I used #caseOf:otherwise: to implement this. The result is about 25%
slower than the original unchecked method. I got very slightly faster
performance by writing it with a bunch of #ifTrue: lines, but I think
the caseOf approach is slightly less ugly.

All other implementations that I tried (including #at:ifAbsent:, and
#on:do) were significantly slower, so I settled on #caseOf:otherwise:
for clarity and reasonable speed.
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