Created ID231EnergyScan.py; Added elemnt to pass to spec
Signed-off-by: oscarsso <oscarsso@esrf.fr>

Added the possibility to retrieve the list of  centered positions vi the XML-RPC server.
Added the possibility to add the current position as a centered position

Signed-off-by: oscarsso <osacarsso@esrf.fr>
Merge branch 'master' of github.com:mxcube/mxcube