Add correlation string to output
Merge branch 'fitting'

Resolved conflict in data_retrieval.html
Add correlation, gaussian and weighted exponential

Add correlation to fit methods. Returns r for linear fits and r^2
otherwise. Add gaussian fit. Now 2 exponential fits. One regular and a
* version with larger weights for larger datavalues.
Merge branch 'fitting'

Add Gaussian fit
Add correlation coefficient
Add additional exponential fit, one weighted and one regular.
Prevent the last bin to be at max value

Slightly reduce max value passed to jsparc.range.
This prevent unwanted additional bin at the end.
Due to rounding precision in Javascript.