1) Treatment of case when projection algorithm to BSpline surface return null 2d curve.
2) Changed approximation of next step in default projection algorithm.
3) Special handling of surface of revolution added.
"Period jump" handling evaded in case when curve not computed.
Test cases for issue CR25892
Small correction of test cases fot CR25892
License statement text corrected; compiler warnings caused by Bison 2.41 disabled for MSVC; a few other compiler warnings on 54-bit Windows eliminated by appropriate type cast
Wrong license statements corrected in several files.
Copyright and license statements added in XSD and GLSL files.
Copyright year updated in some files.
Obsolete documentation files removed from DrawResources.
