Several corrections coming from building and testing on MSVC++ 11:
- compiler warnings corrected in structiges.c (32-bit mode) and BOPAlgo (64-bit mode)
- DRAW command for testing exceptions (OCC6143) refactored for getting some output even if process fails (problem with stack overflow handling)
- DRAW command readstep removed as it leads to hang-up in Debug mode due to waiting for user input; the only test that used it changed to use testreadstep command
Writing and reading tabulated cylinders in IGES were changed in accordance of Type 122 (parametrization [0,1]x[0,1]
some cosmetic changes
Adding test cases for this fix
