working with actual variables, the chart is replaced by google api
tidy up
not updating formula cell was because I was using a wrong cell as input, now fixed
added some graph related variables to the controller
initial implementation of working with graphs with live data
four graphs implemented 1) livestock vs biomass 2) crop area 3) operating cost 4) cash flow
added sensitivity analysis chart
changed the cell returned type to double instead of int in order to show the small variations in the sensitivity analysis
chart aesthetics