Parameter to write offset curves like b-splines was added
Change function, which convert offset curves to b-splines
Added test command "test_offset"
Added test cases bugs/xde/bug23771_1 bug23771_2
added writing planes in Type 108 not like BSplines
pcurves for planes not writing
add parameter for choice between writing planes in BSplines and Planes
0022820: OCCT IGES writer loses plane information
pcurves were prohibited also for BRep mode
Adding test case for this fix