Adding random (to be set) shortcut to the functions: next unproven goal, expand, expand_all, collapse, parent, first_child. These can be accessed from the command line by typing the command (list_ide_command is for help on these commands). Fixing shortcuts with ~key instead of add_accelerator. [get_first_unproven_goal_around cn] now returns a different node from cn and, if a brother of cn is returned, it returns preferably one placed after cn in the tree.
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