Some more fortran safe-ctype & cleanups

[Toon Moene]

Zack Weinberg wrote:

> '\0' is in is_nvspace because we decided it made the most sense to
> treat it as whitespace.  It's a bit risky to add that to the set used
> by Fortran without making sure that this won't break anything else.

Kaveh, I'd like to second this.  Fortran is rather peculiar in its
interpretation of source text (think: 80-column punch card).  Craig
probably arrived at the code as it is after much experimentation (and
complaints ;-)  Please only change it to something that has *exactly*
the same semantics ....

Thanks,

-- 
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