MXGDA-1158 gdaclient: store workspaces/configs in /scratch/gda_{workspaces,configs} as per the "GDA Support Notes" document

If the directories don't exist, create them with write permission for everyone
Merge remote-tracking branch 'origin/8.30'

Conflicts:
	dls-config/bin/gdaclient
ADMIN: changes in preparation for GDA v8.34