factor help message improvement

[Loïc Le Loarer]

Hi All,

I would like to propose a small improvement to "factor" help message:
indicate factor capabilities and in particular maximum input size. As
it depends on how factor has been compiled (with or without GMP
library), I propose the attached patch.

I think it is very useful to know on a given system how factor has
been compiled by the distribution.

What do you think of that ?

Best regards
--
Loïc

patch_factor_help.diff
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