mods for filter operator and ifdefing of nlopt
Merge branch 'master' into vothmods
Initial implementation of filteroperator computation: Still needs i) parallel search, ii) computation of weights iii) application of filter to sensitivities. Basically just computes local graph currently.
Merging in mods that compute filteroperator graph.
Filter operator still needs
i) Parallel graph computation
ii) filter operator coefficients
iii) application of filter to sensitivities.

Merge branch 'vothmods'
Small changes