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Some work to make spectrum layers (and slice layers generally) zoomable in the frequency axis. Also fixes a number of view id mixups in SliceLayer which broke offset calculations for the x axis scale.2017-02-07, by Chris Cannam
Update piper-cpp subrepo2017-02-06, by Chris Cannam
Merge2017-02-06, by Chris Cannam
Subrepo update2017-02-06, by Chris Cannam

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