FreeCAD: fixed an error in the c++ module that caused rectangles moved in freecad to be read incorectly. added test cases to verify whether the rotation is computed correctly for rectangles. git-svn-id: https://svn-agbkb.informatik.uni-bremen.de/Hets/trunk@15113 cec4b9c1-7d33-0410-9eda-942365e851bb