#10 full keyboard-control of the application

[Klaus]

a) workflow "new item": 1) "ins" -> add new item at current position. 2) the tab-character in the definition field should bring the focus back to the selected node in the tree.
b) additional standard hotkeys:
copy (^c) -> (the menu-entry is missing),
paste(^v)-> add with modified key to ensure unique keys,
cut (^x) -> implement & see del
del -> dont loose focus, but bring focus on next item
F2 -> save