ISconf v3 support on linux

Hi all,

Thanks to Stephen Schaefer, Isconf v3 now works on linux.  It should
correctly using a portable summing algorithm.  Longer term, if there is
demand, I may switch to Digest::MD5 (and just skip summing if that lib
doesn't exist), but this will work for now.

Steven, I had to make a couple other modifications than the ones you
pointed out -- I had to add the sum flag twice (once in sum_chk and again
in sum_set), and I also had to load the config variables in ischeck using
Isconf::config.  The version in CVS should work just dandy.

Is this worth putting out another tarball for?  I'm fine doing so; it
takes very little time.

As always, feedback is good.

-- 
  "When a man sits with a pretty girl for an hour, it seems like a
minute.  But let him sit on a hot stove for a minute, and it's longer
than any hour.  That's relativity."   --Albert Einstein


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