Remove selfcal from split-directions

[tikk3r]

This PR removes the self-cal options from the split-directions workflow. The reasoning is as follows:

• Pilot has a dedicated dd-calibration.cwl workflow now
• No other steps in the pipeline use the selfcal output from this workflow
• This selfcal being skipped is causing issues for people to run the pipeline (see the Slack channel discussions) because the output selection is the_only_non_null, but they will be null if skipped
• It will make split-directions.cwl more true to its name by simply covering the job of splitting off various directions with the relevant corrections.

[lonbar]

Looks good to me. Two minor comments.

[lonbar]

@tikk3r there does seem to be a validation issue unrelated to the Python versioning.

[tikk3r]

@tikk3r there does seem to be a validation issue unrelated to the Python versioning.

Ah yes, delay-calibration fails because find-best-delay-calibrator.cwl fails, which is because #113 is not merged yet. That branch takes care of that (I did a quick check with a local rebase of auto-auto-delay on this branch).

[tikk3r]

I accidentally included these changes in the merging of #113 so they have already been merged. My bad...