- add a template TF1::SetFunction from a C++ callable object and a member function.    This follows a request by Mike Marino (see https://savannah.cern.ch/bugs/?34430 )
- add a template TF1::SetFunction from a C++ callable object and a member function. 
  This follows a request by Mike Marino (see https://savannah.cern.ch/bugs/?34430 )

 This fixes also previous SetFunction method, which was not working if the previously created function was 
   not of the right type.


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@23730 27541ba8-7e3a-0410-8455-c3a389f83636

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