Make use of the new environment variable Canvas.SavePrecision in TCanvas::SaveSource.

   // When outputing floating point numbers, the default precision is 7 digits.
   // The precision can be changed (via system.rootrc) by changing the value
   // of the environment variable "Canvas.SavePrecision"
This is the best solution to the problem reported at: <http://savannah.cern.ch/bugs/?25909>


git-svn-id: http://root.cern.ch/svn/root/trunk@18615 27541ba8-7e3a-0410-8455-c3a389f83636