rflot: Initial commit
rflot: Clean-up zoom behavior to correctly account for zoom along y- axis.

Also add todos.
rflot: Now passing x/y/extra.cols/group arguments as expressions rather than just strings.

Provide some sensible defaults - likely more needed.
rflot: Extra data (for example for tooltips) passed using extra.cols parameter
to flotSeries now stored in series.extr_data.

Need to do this, coordinates other than 1,2 in data array (where we had been
storing extra.cols) have meaning for certain types of charts.

Due to the JSON conversion how extra.cols is passed has ramafications in terms
of the structure of series.extra_data.  In particular if `extra.cols = dt`,
series.extra_data is an array.  If however `extra.cols = list(dt)`, then
series.extra_data is an array of objects.
rflot: Add stacked and side-by-side plugins.

Note, order of plugin inclusion in yaml file is important.

Also when grouping series, label is paste0(label, this.group), rather than just
this.group.
rflot: Update README with list of included plugins.
rflot: flotSeries: bugfix: make sure data is an array
rflot: Officially rename package to `rflot`.

Minimize JS files.  Add Jquery to notices.  Add DC Energy as copyright holder.
rflot: Update README
rflot: DESCRIPTION: License update GPL >= 3 (rather than just 3).