Modifications:
Changed the way of finding the angle between the faces.
New static functions:
GetFaceDir - builds direction for the face;
FindPointInFace - finds the point in the face in bi normal direction.
New square values have been set in the following test cases:
boolean bopcommon_complex J1
bugs modalg_2 bug202085_6
bug202085_7
bug202085_8
bug202085_9
bug202085_10.
"TODO" marks have been removed from these cases.
Added test cases bugs modalg_5 bug23853