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).

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