Htheatpump

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* updated copyright statements
* added factory function ``from_json`` to classes ``TimeProgPeriod``, ``TimeProgEntry`` and ``TimeProgram``
* fixed issue with fault lists with larger number of entries (in ``HtHeatpump.get_fault_list()``);
thanks to Alois for reporting
* added new function ``HtParam.check_value_type`` to verify the correct type of a passed value;
the type of a passed value to ``HtHeatpump.set_param()`` will now be verified
* fixed issue with passing a larger number of indices to ``HtHeatpump.fast_query()``

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* added support for Python's "with" statement for the ``HtHeatpump`` class
* added some more unit-tests (especially for the time program functions)
* extended the sample scripts ``hthttp.py`` to query for time programs of the heat pump
* added new sample ``samples/httimeprog.py`` to read the time programs of the heat pump
* added new functions to write/change time program entries of the heat pump (see ``HtHeatpump.set_time_prog...``)
* added new functions to read the time program of the heat pump (see ``HtHeatpump.get_time_prog...``)
* added type annotations and hints for static type checking (using *mypy*)
* splitted up property ``HtHeatpump.verify_param`` to ``HtHeatpump.verify_param_action``
and ``HtHeatpump.verify_param_error``
* renamed exception ``ParamVerificationException`` to ``VerificationException``
* added support for Python 3.7
* dropped support for Python 3.4
* added some more heat pump parameters (data points) in ``htparams.csv``

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* added some more heat pump parameters (data points) in ``htparams.csv``
* extended sample script ``htfaultlist.py`` by the possibility to write a JSON/CSV file
* added new sample scripts ``hthttp.py`` and ``htfastquery.py``
* fixed some formatting (flake8) errors
* some improvement for the reconnect in the ``login()`` method of class ``HtHeatpump``
* changed return type of ``HtHeatpump.get_fault_list()`` from ``dict`` to ``list``
* added support for Python 3.6
* added support for a user specific parameter definition file under ``~/.htheatpump/htparams.csv``
* extended sample ``htbackup.py`` to store also the limits (MIN and MAX) of each data point
* added method to verify the parameter definitions in ``htparams.csv`` during a ``HtHeatpump.get_param()``,
``HtHeatpump.set_param()`` or ``HtHeatpump.query()``; this is just for safety to be sure that the
parameter definitions in ``HtParams`` are correct (deactivated by default, but can be activated by
setting the property ``HtHeatpump.verify_param`` to ``True``)
* added new method ``HtHeatpump.fast_query()`` to retrieve "MP" data point values in a faster way ("Web-Online")
* extended the ``HtHeatpump.login()`` method to perform an update of the parameter limits if desired

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* First release on PyPI.