Some refactors around Reference class.
Optimize initial multipole profile calculation.
Implement Gaussian fit.
MultipoleProfileFitRenderer stub code.
Fix Gaussian fit logic.

Try resampling as uniform distribution in r2 for better Gaussian
fitting.
Profile fit stub(?) code.

Might be working... Still need more tweaking.
Tweaks to profile fitting routines.
Ability to specify desired profile length.
Update some scene and test files.