Add unit to arguments

[pkubanek]

Fix #673. Adds unit to argument list for selected functions.

[janiversen]

Seems you changed mind, about halfway through the modifications and started to use another description, please correct the first half to the latter.

[janiversen]

Der er et pylint problem

pymodbus/repl/client/mclient.py:99:43: W0613: Unused argument 'unit' (unused-argument)
[595](https://github.com/riptideio/pymodbus/runs/7876551304?check_suite_focus=true#step:5:596)
pymodbus/repl/client/mclient.py:300:18: E1121: Too many positional arguments for constructor call (too-many-function-args)
[596](https://github.com/riptideio/pymodbus/runs/7876551304?check_suite_focus=true#step:5:597)
************* Module pymodbus.client.mixin
[597](https://github.com/riptideio/pymodbus/runs/7876551304?check_suite_focus=true#step:5:598)
pymodbus/client/mixin.py:160:55: W0613: Unused argument 'unit' (unused-argument)

[janiversen]

update.

[janiversen]

I wonder what you broke, but I will take a closer look.

[pkubanek]

Added commit to use super() in files I modified.

[janiversen]

LGTM, but I think CI do not like it, could be you are not on the newest dev.

[janiversen]

flake8

[swamper123]

Ci says pymodbus/pdu.py:146:5: E303 too many blank lines (2)

[janiversen]

yes already solved.

[janiversen]

Thanks for the PR, hope you will want to continue.