10 more functions added.

The following functions were added. although, I have checked the working
of the functions individually, I still need to complete the unit test
for those functions).  zCloseUDOData, zDeleteMFO, zDeleteObject,
zDeleteSurface, zExportCAD, zExportCheck, zGetMode, zGetNSCData,
zGetNSCMatrix, zGetNSCObjectData