Renamed CallGraphMessage Success ==> SuccessMsg, to avoid clashes with other types named "Success"
Made 'script' pseudo variable a CallGraphNode, while moving pass to CallGraphTreeNode; a script will be a "non-tree node", in case of multi-party communication
Made 'script', 'here' and 'there' implicit values
Made the type specification for local script vals and vars obligatory; for the time being this will remain necessary

Note: the $_= method in Predef does not seem to be usable; maybe it is the combination with an implicit parameter

Note: in the current setup, LifeFrame does not compile during "gradle build". Maybe a wrong version of scalac is taken.
Workaround: in script speedKeyInput, outcomment the phrase "pass_up1+"