sonic-visualiser: revision graph

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Fix uninitialised bool2014-09-03, by Chris Cannam
Fix incoherent logic for what happens if MIDI arrives while no suitable layer is current (from coverity scan)2014-09-03, by Chris Cannam
Fix local declaration hiding outer scope, which caused export-multiple to export a single file as well as the multiple one (from coverity scan)2014-09-03, by Chris Cannam

less more | rev 794: (0) -300 -100 -30 -10 -3 +3 +10 +30 +100 +300 +1000 tip