Timing improvement modifications in the control unit
-- eliminate use of equalzero (combinatorial logic) in the next state logic tree, instead both ?DUP and THROW route to their states and a test is applied there based in equalzero_r (references registered value of TOS)
-- registered value of NOS is used for dataout bus in memory stores (reverted from commit c90de52205df6d690112ccda95959bc4412091ef)