0027032: [Regression to 6.9.1] Result of bcut has the same volume as the object

0027032: [Regression to 6.9.1] Result of bcut has the same volume as the object

- Avoid reducing tolerance of the original edges in BOPAlgo_PaveFiller::CorrectToleranceOfSE
- If a boundary edge is considered coincident with a section curve then increase its tolerance more carefully, using real distance instead of extended reached tolerance.
- New test case bugs/modalg_6/bug27032
- Test cases boolean/gdml_private/E4-F3 have been amended to check area of the result.

- Puts TODO in test cases boolean gdml_private ZI5,ZI7,ZJ7.