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The value of the buttonset wasn't being read correctly which meant that
the code that checks whether the url is specifying a new value didn't
work correctly either. I've added code that handles buttonsets
separately and retrieves the value of the checked element.

Also remove some unneeded code and move the code that generates embedded
javascipt out of the views.py module.

The report_id values are duplicated between multi and single building
reports, so we need to force a refresh of the ui even if the value
hasn't changed.

Add handling for urls and back button in the reports ajax form

Also changed naming of some methods.

This commit includes changes to the model. You'll have to 'migrate' for
it to work.

- Plotly conversion for Normalized By Ft2 report
- Plotly conversion for Normalized By DD by Ft2 report
- Pandas resample conversion for Excel Export
- Fix bug from last commit in dashboard javascript
- Formatting and layout improvements in the dashboard

- Remove highcharts references
- Read sensor data directly from SqlLite to Pandas
- Make dashboard charts slightly smaller
- Improve handling of multiple y axes on timeseries charts
- Make pandas datetime indexes timezone naive to avoid a resampling bug

Modify the timeseries plot routine to use Plotly instead of Highcharts