Test bridge from nomadgui to nomadservergui

See merge request instrument-control/nomad-gui!7

values are not sorted

to choose between INFO or WARNING icon.

Test if currentselectionplugin is null before testing its value
(nomadservergui management)

prefix and its suffix labels.
Add a very useful method to debug screens' layout: GridDataComparator.

When editing a user script containing a forLoop or an If, the main command zone remains in editDropState state

Fix bug in SettingsCommandBox: radio button proposal/shared was not correctly initialized and endiInit method was called too early