Start working on Graph UI
Add the very basics for graphs

- Put the tab in the main controller
- Add basic code to collect stats every minute
- Add basic code to write the stats to a file
Initial progress on the Graph Tab

- Made scroll and zoom work
- added several new data series
- added ability to show or hide series
- display value under cursor
First stable (experimental) version of graphing
Merge branch 'RFE006.Graphs'
Merge in the first support for the experimental graphing feature