Interface of bopcurves DDRAW-command were extended. Now it is possible to obtain
a) only 3D-curves;
b) 3D-curves and 2D-curves on one of surfaces intersected (surface can be selected);
c) 3D-curves and 2D-curves on every surface intersected.
Use "help bopcurves" to see detail information.
Added test cases bugs/modalg_5/bug25697_1 bug25697_2
Small changes in test case bugs/modalg_5/bug25697_2
