String json syntax for plugin descriptors
Added parameter to show/hide the banner.
banner, toolbar, timeslider add contents to header. Layout just creates header space holder.
Changed configuration node name to "default-conf".
Configure logger
Configuration of the DataSource in the web-fragment.xml of core.
Demo includes the PostgreSQL driver.
Database table is parameterized.
When missing, table is created when the application starts.
DBFeedbackPersistence common code refactored to DBUtils.