Bronkhorst-propar

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- Added ``__version__`` attribute.
- Added ``dde_nr`` and ``parm_name`` fields to output parameters of
``read_parameters``, when they are present in the request parameters.
- Added experimental support for Propar ASCII. Can be enabled with
``master.propar.mode = propar.PP_MODE_ASCII`` (mode is set to
``propar.PP_MODE_BINARY`` by default).
- Changed formatting for debug messages to: ``TX/RX (Length): Data``.
- Fixed bug in reading strings from response message (in a chained
read).
- Fixed bug in request/response matching where when re-using a master
after aborting a running action (for example CTRL+C in an interactive
python session), sometimes the old response to that action would
match the new request.

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- Reduced CPU load (set timeout of serial port in propar provider).

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- Fixed issue with matching requests to responses in master. Improved
compatibility for ``master.get_nodes``.

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- Changed debug message to only show when flag is set.

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- Compatibility improved in ``master.get_nodes`` function on propar
master.

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- Improved propar performance, added additional dump mode.