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

add ability to print a plot in qgpibplotter

force display of opened file, instead of just adding ot to the plots list

started developer doc

small cleanups and doc update

Improve docs.

Moved .plt example files in a hpgl_plots subdirectory.

Display an introduction message when running gpib_detect.

make q3562 app work again (in test mode at least)

Small fixes to HPGL plotter (be a little bit more robust)

updated introduction doc

added copyright header to every python file

fixes to make gpib_detect works

add a simple 'gpib_detect' command line tool and some minor fixes

added doc (almost empty) files

finish some previous unfinished (!) refactoring

cleanup: removed useless commandregister (and fix some missing import)

Added commands for HP356X devices. Added STA, IS and AS as commands (instead of constants).

Make it possible to disable the cache mecanism temporarly and make AbstractCommand derivated classes not considered as commands if their name starts with '_'.

make convert_from prototype accepts several arguments (to build command with several arguments)

Some improvements & cleanups. Now the get/set mecanisme using descriptor works (but is not yet implemented for most commands of the HP356X devices).

Try to be a little more robust when instanciating the GPIB class (serial connector)

add de debug "manage_srq" method on HP356XDevice

An AbstractGPIBDevice and the Command should now behave quite OK ie. one can type d.MyCommand and it will return the value (either from the cache or after having asked it to the device), and use d.FRS = 10000 to send the command "FRS 10000 Hz" to the device transparently.

Major refactoring in progress. Build the toolkit around a GPIB controller which have a communication thread with the devices. Every device is an instance of a class that describes the device model and registers itself to the controller.

added several example coord datablock & make use of some icons

oops, forgot the resource file

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