Make interpolated Q-transform spectrograms single precision
Created by: alurban
This pull request ensures that interpolated Q-transform spectrograms are populated with single-precision floats, to save memory. It also slightly expands unit tests for the Q-transform, and fixes one of the documentation examples to use outseg
rather than crop
.
This fixes #1050 (closed).
cc @duncanmmacleod, @tjma12