added a check for the contrast of the BSM as calibration stage 9. this includes
- making a BS on N/e on Alice. for that I added a CNOT on m_I=0 (pi/2pi) calibration in stage 2.
- support for repetitive readout in the eN readout msmts.

I tested stages 2/3 and the new stage 9. 9 works with and without repetitive readout, so it looks like there's no error introduced.
msmts.