Inconsistent argument names for DUP and SWAP instructions

[Vyslon]

For DUP2 and DUP3, the ignored arguments are named (a and a, b) but for DUP4 ... DUP16 they aren't named (which make more sense since they aren' t used by the instruction).

Same for SWAP2 which is inconsistent with SWAP3 ... SWAP16

[Vyslon]

It would be better to have [...] [value] for each DUP instruction

[Vyslon]

Same issue for the stack output