Add svg datagraph routines
Add initial diagram plugin
remove left over update function
remove unused variables and function calls
remove commented out code
remove addSVG from datagraph ctrl
renmae SVGImage to svgimage
don't create widgets outside of the main thread

This removes the flood of Pixmap error messages
update SysCSimCtx for pretty printer
remove unused stuff from svgimage.py
remove SVGTemplateHandler
simplify svgview to svgvw
fix import
use cpp2py to get real value
remove debugging leftovers