Generalize data retrieval view

This is just a partial generalization to chart all data from all data
sets for a given plugin.  Only gauge and counter data types are
currently handled.
Layout changes

Added a view to show plugins that data has been collected from.  Added
the use of jQuery to apply a layout.  Other miscellaneous updates.
Prefix data series on chart with more information

This will help keep the data readable when we can plot more data onto
the same chart.