- introduce a better treatment of the step size used when fitting an object with a TF1. Use now by default is not zero the error provided by TF1. In case of limits use an appropriate step size to avoid Minuit to go over the limits.  This fixes the warning reported at http://root.cern.ch/phpBB2/viewtopic.php?t=8067
- introduce a better treatment of the step size used when fitting an object with a TF1. Use now by default is not zero the error provided by TF1. In case of limits use an appropriate step size to avoid Minuit to go over the limits. 
This fixes the warning reported at http://root.cern.ch/phpBB2/viewtopic.php?t=8067


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@27553 27541ba8-7e3a-0410-8455-c3a389f83636

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