MXGDA-1010 prevent EpicsChannelManager from being created more than once
Merge branch '8.30' of ssh://dascgitolite@dasc-git.diamond.ac.uk/gda/gda-epics.git into 8.30
Add getPvName method to EpicsScannable so that pvName isn't a "write-only attr"
Revert "Merge branch '8.30' of ssh://dascgitolite@dasc-git.diamond.ac.uk/gda/gda-epics.git into 8.30"

This reverts commit 048bd5566e9427258e5f87c3a73dfe49b2b5096e.
Zebra - allow recording of time of capture
Merge remote-tracking branch 'origin/8.30'