Work Progress - Mar 2 - Mar 8

Check the demo from the "SB in beta" link above.

* Save z-positions of the scriptlets in XML file, so we can reproduce exactly how the scriptlets are overlapped when loading the XML file.
* Disable drag of event codelet from the left EventManager panel when it is already in the middle scriptlet window. See below - the event codelet "Do Forever" is blanked out when the corresponding entry is in the middle scriptlet.


* Disable scrolling of panel when dragging codelet for the middle scriptlet window (Possible further action: make the scriptlet area auto-expandable. Currently the area is fixed.)
* By pressing the arrows of the separators (see image below), one can expand the scriptlet window to the right end of the window. Likewise, one can expand the graphic window to full screen. (Possible further action: collapse the scriptlet panel and initial property panel automatically when the simulation begins, expand them back when the simulation stops.)