sonic-visualiser: revision graph

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* updates to tip dialog2007-03-13, by Chris Cannam
* Add basics of an Export Image File function2007-03-12, by Chris Cannam
* Basic beginnings of what will become a tip-of-the-day dialog2007-03-09, by Chris Cannam

less more | rev 122: (0) -100 -30 -10 -3 +3 +10 +30 +100 +300 +1000 tip