updateNodeChildren(ComponentContainer metacont) Updates (sub)nodes of a container (in Component Inspector) after
a change has been made (like component added or removed).
Public method for saving form data to file. Does not save the
source code (document), does not report errors and does not throw
any exceptions.
whether there was not any fatal error during saving (true meanseverything was ok); returns true even if nothing was savedbecause form was not loaded or read-only, etc.