Added gr_probe_signal_X and gr_probe_signal_vX.
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.
docs: fixed some markup of formulas between html and xml (and therefore the swigdocs).
core: fix a warning.
core: expose nthreads setting through to fft_filters.
Can set nthreads as last arg to filter; defaults to 1 so no change in default behavior.
core: expose nthreads capabilities to gr_fft_vcc.
Can set and get nthreads; defaults to 1, so no change in default behavior.
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