Comment to remind myself to fix conditions in fitting function
Comment to remind myself to make plot naming more general.
Added trendengine with point number selection.
Working trendengine.
Added calling trendengine from the user interface.
Capitalized axes labels.
Simplified conditions in fitting function, now they are nested, and there is only one path that needs to do something other than print.
Added the option to specify the plot title in the argument.
Changed plot title for trend plots.
Fixed bug where the max point number wasn't valid.
Changed docstring for trend method to prepare for a second one
Added methods for changing plot limits.
Fixed point number range.
Made PlotEngine have a copy of yerrors.
Consider point errors in fit.
Added checking for the rare case that cov matrix is infinite (for example when trending on only 2 points).
Checking for rare cases and option to trend on point number or x coordinate.
Doc string fix
Added a select x coordinate function to trendengine. Yet to be tested.
User interface now supports two methods of trending.