based on the Grisu1 algorithm. This corrects several precision issues
    with the previous code used to perform such conversions (patch by
    Max Nazhalov, mantis #25241)
   o adaptation of several tests to deal with the better precision of these
     routines compared to the previous version
  Please don't remove the real2str.inc file yet, it's still used by the
  JVM target for now

git-svn-id: trunk@25888 -