Debugging case refs

[John Darrington]

It's almost impossible to track down memory leaks when ref counted
objects are involved.  I'm proposing this patch to case.[ch] which
allows a preprocessor option to be set redefining case_ref and case_unref 
to unconditionally copy and destroy cases respectively.  

It would be easier to use if we could put the switch entirely inside case.c,
since almost everything depends upon case.h -- but we could only do that
if we sacrificed the benefits of the inline functions.


J'

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