Added cross-section averaging functionality to the CASMO API
Merge remote-tracking branch 'upstream/develop' into develop
Fixed bugs in average calculator
Added functions to Casmo API to average cross section values across each material type and added another function to write these values to an HDF5 file.
Made HDF5 input compatible to be read into OpenMOC
Fixed stylistic bugs
Merge remote-tracking branch 'spavlick/develop'

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