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[Tom Dimiduk <tdimiduk@xxxxxxxxxxxxxxxxxxx>]

I just pushed an initial implementation of parameter tying to dev (v102).

holopy.fit now accepts an additional optional parameter tie which is a 
scatterer object specifying parameter tying relationships.

This scatterer should have parameter values of 0 or None for any 
parameters that are not tied, and a unique value for each group of tied 
parameters (so for example 1 for index, 2 for radius)

An example of using this would be:

tie = SphereCluster([Sphere(n=1, r=2, center=None), Sphere(n=1, r=2, 
center=None])

fitresult = fit(..., tie=tie)

This would fit a dimer with index and radius tied for the two particles. 
 I believe this only works while imaginary part of the index is fixed 
(which we always do, so I am not worrying about it).

Tom