core: protection if set_delay is called before the last delay update has finished.
core: in delay block, protect against repeated calls to set_delay with the same value.
core: core: change to the delay QA code.
The full vector is received because of the switch to a gr_block, so we exted the expected_data vector; otherwise, the results are the same
core: allowing delay to be dynamic for runtime changes to set_delay.
This converts the block from a gr_sync_block to a gr_block since it has to return and consume different amounts when the delay setting changes.
Merge branch 'maint'
docs: better handling of html only for formulas.
gui: better handling of buffers in oscope for stripchart/non-stripchart.
core: updated missed vfc version of fft block to use nthreads.
Also updates copyright dates.
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