## Description:
More fixes flagged by pylint 2 that don't hurt to have before the actual pylint 2 upgrade (which I'll submit soon).
## Checklist:
- [ ] The code change is tested and works locally.
- [x] Local tests pass with `tox`. **Your PR cannot be merged unless tests pass**
* Update nut.py
Added input.frequency and a number of output parameters.
* Update nut.py
Fixed formatting issues
Added "devices" fields
* Separated "device.description" line to two lines.
* Update nut.py
Removed device.* sensors
* removed default value from required parameter; raising PlatformNotReady when connection to nut unavailable; output human-readable state name by default
* removed superfluous sensor name part; showing human-readable form and raw value of current status in more info dialog
* introduced a new virtual sensor type based on the raw status value but used to display a human-readable form of the status
* renamed method
* format string instead of concatenation
* revert the change to the device state attributes - only output the human-readable status without the raw value
