Signal-Agilent_33600A
---------------------

2020-03-06: fixed: Phase is not set in DC mode
2020-02-07: fixed: frequency is correctly set for arbitrary waveforms
2020-02-06: added: support for choosing arbitrary functions
2020-01-31: fix: ask for OUTP? during poweroff which somehow makes sure that the devie really switches off
2019-10-16: bugfix: if 'Period [s]' is selected as sweep mode, the unit of the return value must be 's'
2019-10-09: variable is correctly created from Sweep mode; Waveform Arbitrary added
2019-09-05-r1: multichannel is a static variable now (>= v1.5.4)
2019-09-05: multichannel is given as static method (>= v1.5.4)
2019-02-15: first upload