Remove the requirement for <stdarg.h> that was introduced to lev_comp.
USE_STDARG still works. USE_OLDARGS required hackery but has been
tested and actually works, although I wouldn't trust it on platforms
where 'long' and 'char *' aren't the same size. USE_VARARGS didn't
require any hackery--aside from the conversion to core's pline code--
but has not been tested: <varargs.h> supplied with OSX won't compile,
with an #error directive that basically says "switch to <stdarg.h>".
I changed several printf formats of %i and %li to %d and %ld because
I'm not sure how widespread the 'i' variant was back in days of yore.
[TODO: avoid use of snprintf since pre-ANSI systems won't have it.]
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