Ticket 411 - [RFE] mods optimizer
    
    Description:  If there is a series of identical operations on the same attribute it takes
                  much longer doing each mod seperately, as opposed to combining the values into
                  one mod operation.  Optimizing this can only safely/efficiently be done to sequential
                  ops of the same attribute and mod type.  Once the chain is broken, the optimization
                  stops for that particular mod, and we start over on the next mod operation.
    
    https://fedorahosted.org/389/ticket/411
    
    Reviewed by: richm(Thanks!)