Created a base class for the user function GUI elements.
The molecule icon is now set to a 22x22 pixel size.
The molecule icon is now shown in the spin tree view.
The spin tree view window menu entry is now active.
The script user function GUI element is now functional.
Changed the default arg values for the openfile GUI element.
Added a package for user function GUI elements.
Created a menu called 'User functions', and added the first entry 'script'.
Renumbered the help menu entries.
The molecule icon is now shown in the tree view.