[m-rev.] for review: switch representation for debugger

[Ralph Becket]

Zoltan Somogyi, Wednesday, 18 April 2007:
> 
> Fix a problem with the representation of goal paths for switches on unbounded
> numbers of function symbols, such as ints, floats and strings. We used to
> represent such switches as a negative number in the field representing the
> number of function symbols in the switched-on type, but some parts of the
> system weren't handling negative numbers specially, and they couldn't be
> properly parsed back in anyway (since "-" was also the character separating
> the case's ordinal number from this number).

Looks fine to me.
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