added some hpgl example plots

refactoring: created a 'plotter' subdirectory and put everything related to GPIB/HPGL plotting under it

added generated rc files (from hpgl_plotter.qrc)

removed useless png files (using SVG everywhere)

oops, forgot icon files

added a start scrip & cleanups

added a gpib plot receiver mockup for testing purpose. Seems to work.

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mercurial