Updates settings to match the new naming scheme (singlePopMcmc)

Comments out the loading of priorMean[CARBONICITY], but doesn't actually remove it from the code. It's still useful/used by certain applications, so removing it would do more harm than good. Additionally, it will be available if we'd like to put a non-uniform prior on carbonicity in future
Removes fsLike printing (not useful)
Makes random seeds a bit cleaner

Makes all applications generate a random seed if none is given (or, technically, if the 0xffffffff is given)
Makes all applications print the seed only if it is randomly generated
Removes _seed from mpiMcmc filenames, as it caused more problems than it solved.
Modifies makeCMD to use the same gridding algorithm as margEvolve