core: enable use of fftw's threading capabilities.
Can set nthreads when creating an fftw class; defaults to 1, so there's no change in default behavior.
Merge branch 'maint'
io: fix triggering and performance issues with oscope; specifically for the strip-chart features.
core: fix floor ambiguous overload in vcc fftw
The msvc compiler doesnt like the ambiguous overload of floor.However, floor should not have an effect on the integer divide anyway.
core: fixed bug in FFT shift operation.
core: fix for off-by-one issue in strip chart. Increases buffer size for longer displays.
core: the burst_tag block can have user-defined keys and values for the tags when a burst is on or off instead of static values. Defaults are the same. Use set_true_tag and set_false_tag to override these.
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