New classes to get a much improved performance in the computation of

New classes to get a much improved performance in the computation of
the contours of the various elements in the tracker (manu, buspatch,
detection element, chamber). With this improved algorithm, we can now
stop to use the padstore.root file (which used to contain pre-computed
contours, as that computation was really long) in mchview.
At the same time we achieve a better separation of the contour computation
and graphical representation. So AliMUONPainterContourMaker and
AliMUONPainterContour classes are removed, and the contour and
contour making are now part of the more general geometry library,
instead of the graphics one.

New classes :
                  AliMUONContour
                  AliMUONContourMaker
                  AliMUONContourMakerTest
                  AliMUONContourPainter
                  AliMUONManuContourMaker
                  AliMUONNode
                  AliMUONPainterDataRegistry
                  AliMUONPointWithRef
                  AliMUONPolygon
                  AliMUONSegment
                  AliMUONSegmentTree
                  mapping/AliMpUID

(Laurent)