0024122: Hang-up during a topological operation.

0024122: Hang-up during a topological operation.

I. New features:
no New features.

II. Changes:
II.1. class : BOPAlgo_Builder
   - method:
void BOPAlgo_Builder::FillIn3DParts(BOPCol_DataMapOfShapeListOfShape& ,
				    BOPCol_DataMapOfShapeShape& ,
				    const BOPCol_BaseAllocator& )

The algorithm of finding 3D-parts for solids has ben changed.
To improve the performance the unbalanced binary tree is used.

II.2. class : BOPTools_AlgoTools
   - method:
Standard_Boolean BOPTools_AlgoTools::GetFaceOff
  (const TopoDS_Edge&,
   const TopoDS_Face&
   BOPTools_ListOfCoupleOfShape& ,
   TopoDS_Face&
   Handle(BOPInt_Context& )
The data treatment for tangent cases has been changed

III. Modified entities:
packages:
BOPAlgo
BOPTools

Small corrections of test cases