delta for which 1.0 and 1.0+delta is different, rather than
    some power-of-10 ballpark equivalent (fixes mantis #11308)
  * print the same number of digits for doubles on systems
    which support extended as on those which don't (i.e.,
    one digit less on the former). This solves regressions after
    the previous change and is Delphi-compatible.
  * adapted tests for the previous change

git-svn-id: trunk@11025 -