More efficient usage of clique sizes.

[mnarayan]

Proposed modifications to https://github.com/TheEtkinLab/2018-tms-netsci/blob/master/src/models/cc_fmri_persistent_conductance.m

• Create a version that only counts maximal cliques of size 2, 3, and >=4. It looks like cliques of size 5 or more are often highly unstable and are not to be found across majority of resamples.

• For more expanded clique version, only use n_cliques that are non-zero

• Do the same for both conductances and degree.