This patch offers conversion string<->float
conversion functions that are locale agnostic.  This
way, Python will be able to run perfectly even when
LC_NUMERIC is set to something other than C.  It
happens frequently when using external modules that
these modules change LC_NUMERIC without python knowing
about it.  It will never stop happening, unfortunately,
so it is best to make python not depend on LC_NUMERIC
being always set to 'C'.