propagate number_cores to facet_selfcal.cwl

Matthijs van der Wildrequested to merge
35-facet_selfcal-step-missing-resource-requirement into master

This MR adds an input which allows a user to increase the number of cores which are required to run steps/facet_selfcal.cwl. The default value of this input has been set to 12, but it can be tweaked in the delay calibration workflow.

Closes #35 (closed)

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