BLVI-100 (8.36) Expose SocketBidiAsciiCommunicator fields for derived
class, UViewTcpSocketConnection.
GDASCRIPTS [Cherry pick from master] Fix failing test caused buy fixing a bug in metadata.py

Sorry for cherry pick.
MXGDA-1248 allow MotorPositionViewer to have a callback which is invoked in preference to commandFormat when demand changed
Merge branch '8.34'
Merge branch '8.34' of ssh://dascgitolite@dasc-git.diamond.ac.uk/gda/gda-core.git into 8.34
BLVI-65 8.34 - changed SocketBidiAsciiCommunicator to facilitate
overriding.
When "Panic Stop" is pressed, do the panic stop in a job

I have no idea who made this change (on I24) but it seems reasonable...
Merge branch '8.34'

Conflicts:
	uk.ac.gda.client/src/uk/ac/gda/actions/StopAllHandler.java
Add new command meta_clear in metadata_commands.py