Progress: Added FOM for three basic MC solves

Added FOM as part of 'timeman' and 'timevars'.
'LPMC' and 'atmixMC' cannot compute this, right?  Currently I have computed but not printed these values, because they do not contain realizations.  You could compute a variance to use, right...?  I should investigate this, then either add variance and calculate FOM, or never allocate or compute for these methods in the first place.