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add mind-mapping mode (inspired by freemind/freeplane)
i.e.
when switched to MM mode:
a) arrows jump across existing nodes (not freely moving hand cursor)
b) Ins adds node to currently selected node
c) Ctrl-Arrow moves node and all sub-nodes in the direction of the arrow
d) ? SPACE hides/unhides selected node sub-nodes
e) ENTER creates sibling of currently selected node
+ maybe some other