Successfully added Memory Controller subclass for Fixed Time.
MemoryControllerFT is instantiated in place of the base class if the PerThread queueing structure is parsed from the System.ini file. The subclass for the CommandQueue will be added next (as is minimally required). If it seems feasible subclasses for Transactions and BusPackets will be added as well, but they seem to be very tightly coupled with the parent and instantiated frequently. Eventually the parser check for the queueing structure will be replaced with a new System.ini parser check, or with a new command line option, but it is unclear how this command line option will be set in GEM5.