Added demo plugin plugin code.

Added the code necessary for the demo_plugin plugin.
Added script to grant execute rights and public synonyms if the code
user and ppliction user re not the same.
Added variations of the same image.

Added variations of the same image.
Added jQuery UI theme chooser

Added the ability to change th jQuery UI theme.
Added code of demo plugin

Added code of the demo plugin and moved code needed for the application
from source to ppliction