added comments and adjusted line lengths to fit style guide
fixed PR issues
added cmfd linear algebra functions and LRA cmfd input
made minor edits for PR
added ModularTrackGenerator files
created shared memory parallel ModularTrackGenerator and ModularCPUSolver
added ModularCPUSolver and decomposed sample input files
modified plotter
merged with most recent changes in develop
changed ModularCPUSolver to have 4 color ordering to avoid corner flux passing inconsistencies