* Avoid linear search for emeter realtime and emeter_today
Most of the time the data we want is at the end of the
list so we now search backwards to avoid having to
scale all the data and throw most of it away
* more tweaks
* coverage
* coverage
* preen
* coverage
* branch cover
* Basic fix for issue: https://github.com/python-kasa/python-kasa/issues/373
Change usage module get_daystat and get_monthat to return dictionaries of date index: time values as spec'd instead of raw usage data. Output matches emeter module get_daystat and get_monthstat
* Fixed some formatting and lint warnings to comply with black/flake8
Use the new _convert function in emeter for all conversions rather than the one in smartdevice.py
Removed unused function _emeter_convert_emeter_data from smartdevice.py
* Added a first pass test module for testing the new usage conversion function
* Changes based on PR feedback
Tidied up some doc string comments
Added a check for explicit values from conversion function
* Rebase on top of current master, fix docstrings
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Co-authored-by: Teemu Rytilahti <tpr@iki.fi>
