[qt5] fix QMplCanvas

port HPGL plotter emulator to PyQt5

[py3k] beginning to port to py3k

fix README

copyright updated

add an interactive session helper file

fixes in HP8904 device description

add more commands to HP_8904 device

add some commands to HP8904 device

many improvements:

Add an option to qgpib_plotter to make it auto display any newly received plot (+ fix in plot list management)

fix small bugs in qgpib plotter

(0) -12 +12 tip

mercurial