Modifications:
1. Test cases boolean bfuse_complex J1 P9 have been fixed (the function IsInternalFace has been modified to use the function GetFaceOff);
2. Test case chl 902 H3 has been fixed (changes in the treatment of section edges);
3. Test case boolean bsection D8 has been modified (removed TODO statement);
4. Test case boolean bsection A3 has been modified (as the shapes have been changed).