Allow ProcessingDetectorWrapper to be configured not to include 'path' in its data

This is to fix a problem found on MX beamlines where a detector returned a 2D
dataset, and a ProcessingDetectorWrapper treated the dataset as a path, and
included the dataset in the data written to an SRS file. The 2D dataset
appearing in the SRS file (in an abbreviated form) prevented the file being
loaded properly.
MXGDA-343 Switch CommandProcessorComposite to use only the new layout

uk.ac.gda.client.CommandProcessorComposite.showgroups property is no longer
used.
Merge branch '8.30'

* 8.30:
  MXGDA-343 Switch CommandProcessorComposite to use only the new layout
  Allow ProcessingDetectorWrapper to be configured not to include 'path' in its data
MXGDA-344 Change CommandQueueComposite to always number rows

uk.ac.gda.client.CommandQueueComposite.showrownumbers property is no longer
used.
Merge branch '8.30'

* 8.30:
  MXGDA-344 Change CommandQueueComposite to always number rows