-rename the function ForceWriteInfo to ForceWriteInfoClones

-add a new function
  virtual void ForceWriteInfo(TVirtualStreamerInfo *info, Bool_t force) = 0;


git-svn-id: http://root.cern.ch/svn/root/trunk@24217 27541ba8-7e3a-0410-8455-c3a389f83636