Keyoscacquire

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New command line programmes for listing visa devices and finding config

- Added command line programme ``list_visa_devices`` to list the addresses
of the VISA instruments available
- Added command line programme ``path_of_config`` to show the path of ``config.py``
- Explicitly setting scope to transfer in unsigned ints when doing ``BYTE``
and ``WORD`` waveform formats
- Added functions for setting oscilloscope to running and stopped, and for
direct VISA command write and query
- Changed dependency from visa to pyvisa (the package called visa on pypi is
not pyvisa..!), and added tqdm dependency
- *No compatibility*: ``get_n_traces`` now called ``get_num_traces``
- And minor cosmetic changes

- Cosmetic change in README, clarifying changelog for previous version

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- When using ``Oscilloscope.set_options_get_trace_save()``, channels are now
comma separated in the csv to provide channel headings according to the data
columns. This is not directly compatible with previous versions as these had
two lines of preamble in csvs, whereas it is now three (Instrument info,
columns descriptions, date and time)
- Added BYTE/WORD issue to README

- Logging gives elapsed time in milliseconds
- Change in logging level for elapsed time