+ code cleanup
+ fixes #0001690: sketch.getPoint crashes FreeCAD if the point does not exist
+ fixes #0001689: Show name of the drawing page in the tab of the drawing
improvements to exportDRAWEXE

load only MODELING module instead of ALL
improve sweep output
support for point, vertex
cache object names to reuse them in DRAWEXE
do not expode spine which are allready edges
don't try to make faces from arcs (if this failed in FreeCAD allready)
use rounded floats if they safe digits

Sometimes the floats seems to be rounded to twelve decimal
places. we round them if it allows so safe digigts.
round angles