From Wim:

 o) changed shapes.py to closer mimic shapes.C
 o) removed "hysteresis" for strict memory policy
 o) added __str__ for buffers
 o) fixed code violations
 o) changed TTree member access lookup order


git-svn-id: http://root.cern.ch/svn/root/trunk@15652 27541ba8-7e3a-0410-8455-c3a389f83636