Replaced ListVA default value with a non-mutable one
Disabled ListVA notifier because of Pickling issues
Merge branch 'development'
Merge branch 'master' of delmic-server.local:odemis
model: ensure that ListVA also works when used remotely

Need to convert back the special NotifyingList into a normal list, to allow pickling.
New Proxy that converts the normal list into a special notifying list every time it receives the value.

It's propably dog slow. But we care more about correct behaviour than speed, and normally the lists we use are < 10 elements, so it should be fairly cheap anyway.