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Avoid compiler warningstonioni 2014-02-04, by Chris Cannam
Fix for treating zeros as gapstonioni 2014-01-30, by Chris Cannam
Merge from default branchtonioni 2014-01-28, by Chris Cannam
Bodge in Matthias's suggested normalise-to-log as an option in spectrogram and colour 3d plot layers (not wired into gui)2014-01-28, by Chris Cannam

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