Add context menu for options list
(#3)
Add hotkeys to save (Ctrl+S) and reload (F5) options
(#3)
Show hotkeys in context menu
+ fix <key> identifiers
(#3)
Disable "Remove" items, if there is no selected rows
(#3)
Exclude already removed nodes from selectedItems
(#3)
"Add" item: select added row
(#3)
Set "disabled" attribute on menuitem manually
(for Firefox 1.5 and 2.0)
(#3)