Add leakage calibration for DI calibration

[jurjen93]

Add automated full-jones/leakage calibration during delay-calibration, as that allows us to perform polarisation studies.

[lmorabit]

André added a new option in DP3 called leakage - does the same as Full Jones but in a stable way. This needs to be tested: vs. Full-Jones vs. Leakage solve. Waiting for an updated container to test this, but then there are many suitable test data. Shane suggests testing this on a field with a strongly polarised source (e.g. 3C303). The RMgrid catalogue can be used to identify bright sources to avoid nasty surprises.

[jurjen93]

We can carry this ticket for implementation over to the next busy week?

Meanwhile we can test the leakage solve and collect testcases, so we can have a few people working on the implementation of the automated pipeline version during the busy week.

[lmorabit]

Vijay suggests using Shane's information to identify un-polarised LBCS calibrators