[db] upgrades xml to v5 - trying out a 'cleaner' edge definition, still
don't like the way source/sinks bind to edges though
[db] v5.xml and parser now implement full v5 functionality (except for
serializing)
[db] some edits to parser.serialize. Not ready for use yet
[db] improves topic lookup method
[db] modifies asciiplot to be able to draw nodes to pub and subscribe to
same topic
[db] asciiplot now respects rank!