qiskit_to_tk incorrectly converts multi-controlled gates

[yao-cqc]

This following "00" controlled X gate is incorrectly translated to CCX.

from pytket import Circuit
from pytket.extensions.qiskit import qiskit_to_tk
from qiskit import QuantumCircuit
c = QuantumCircuit(3)
# last arg: activated by state "0"
c.ccx(0,1,2,0)
tk_circ = qiskit_to_tk(c)
print(tk_circ.__repr__())
# [CCX q[0], q[1], q[2]; ]

[CalMacCQ]

Oh dear, this could be due to a change I made in #50

Edit: I don't think this is caused by my PR. None of the changes made concerned passing custom control states to qiskit instructions.

Can we handle gates with custom control states easily?

[yao-cqc]

Oh dear, this could be due to a change I made in #50

Can we handle gates with custom control states easily?

I think the easiest way at the moment is to add X gates during the conversion.