- From Guido Volpi:

- Redefinition of some static variables: in global variable the flag is
  not needed, in other part the definition as const is better.
- MakeLegend() method can have 4 arguments that represent the TLegend
  position: TPie::Makelegend(x1,y1,x2,y2). The default values are the old
  one.
- Added the method TPie::SortSlices(Bool_t); this method sorts the
  TPieSlices according the values in increasing (kTRUE) or decreasing
  (kFALSE) order.
- Added the two more drawing options ">" and "<", to draw applying the
  increasing or decreasing order.


git-svn-id: http://root.cern.ch/svn/root/trunk@20538 27541ba8-7e3a-0410-8455-c3a389f83636