we support writing more digits than are defined (due to Delphi-
    compatibility) and
   a) correcting the precision of undefined digits makes no sense
   b) as a result, this precision correction made some numbers that can be
      represented exactly in single precision inexact
    -- fixes mantis #14230
  * no longer perform precision correction while determining the whole part
    of numbers (usually did nothing anyway, and the rest is caught by the
    final rounding)

git-svn-id: trunk@13574 -