Shape Healing interface update #189

Shape Healing interface update #189

New class XSAlgo_ShapeProcessor is added. It reimplements functionality
of XSAlgo_AlgoContainer and makes it more convenient to use.
XSAlgo_AlgoContainer is now internally uses methods of
XSAlgo_ShapeProcessor when possible.
New overload of Perform() method is added to class ShapeProcess. It
accepts a set of flags that defines required operations instead of
string.