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Import problems from Python 2 to 3.  A number of Django upgrade issues.

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

To the Periodic Script feature.

Also, restructuring of the Settings file into a BMON-specific file and
then a file containing Settings that are generally the same across BMON
installations.  This settings_common.py file can be put under source
control and updated as needed over time.

Also formatted admin fields for easy input, incorporated markdown into
html template, and added python-markdown to requirements.txt file

Also finished model changes for Alerts.

Also added a new multi-building chart type skeleton for showing sensor
values across multiple buildings.

Fields were added to the BuildingToSensor model to provide Dashboard
and alert information.  That information was used in the Dashboard
chart type to return the data necessary to create the Dashboard to
the Browser.

Choices for Building Charts are now fixed and the same for every
building.  Also created South migration to update Django database.