Moves Settings initialization into main() and makes it a class variable in MpiMcmcApplication
Disables all applications but mpiMcmc, and mpiMcmc tests

Necessary to save me from going mad while I do massive refactoring of structure
Moves the propClust*s into MpiMcmcApplication
Comments out unused (by mpiMcmc) functions
Removes local copy of the Mersenne Twister and replaces it with use of the std::random functions.
Moves logPostStep into mpiMcmc
Moves to calculating wdGrids dynamically instead of creating gigantic arrays.
Moves loadModels() code into makeModel
Refactors model factories out of makeModel
Removes loadModels entirely
Turns gBaraffeMag into a BdModel
Removes all the brown dwarf code
Adds missing decimal precision to Renedo models