Fix 2 bugs when using the Buffer:   - bug https://savannah.cern.ch/bugs/?77956    number of entries was wrong after drawing (when calling BufferEmpty(-1) ) because statistics was not reset.     To fix this add option "ICES" in TH1::Reset (reset integral, content,error and statistics)   This bug was introduced as side effect by fixing https://savannah.cern.ch/bugs/?71251
Fix 2 bugs when using the Buffer: 
 - bug https://savannah.cern.ch/bugs/?77956
   number of entries was wrong after drawing (when calling BufferEmpty(-1) ) because statistics was not reset. 
   To fix this add option "ICES" in TH1::Reset (reset integral, content,error and statistics)
  This bug was introduced as side effect by fixing https://savannah.cern.ch/bugs/?71251

 - bug https://savannah.cern.ch/bugs/?79303
   When copying histogram the buffer is copied and also the bin contents without setting a flags that the buffer 
   has been emptied. 
   This is fixed by copying the Buffer after copying the BinContent, so the correct buffer status is copied. 


- Add option "ICES" in TH1::Reset (reset integral, content,error and statistics)


git-svn-id: ecbadac9c76e8cf640a0bca86f6bd796c98521e3@38647 27541ba8-7e3a-0410-8455-c3a389f83636

dawehner/root,dawehner/root,dawehner/root,dawehner/root,dawehner/root,dawehner/root,dawehner/root,dawehner/root