CCTK_RegexMatch does not return a distinguishable error condition when the regular expression is invalid

CCTK_RegexMatch right now returns 1 if the pattern matches the string and 0 if either the pattern does not match or could not be compiled via regcomp. It would be useful if user code could distinguish between these two cases. The attached patch changes the return value in the "does not compile" case to -1 and updates all source files that I could find that use it.

Note that this patch changes behaviour of a routine. It used to return 0 for non-compiling patterns so thorns that test for C-like true would interpret invalid patterns as does-not-match, but will interpret the -1 return value as does-match.

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