digital: remove stray import from QA test
sphinx: Completed pmt docs.
qtgui: don't calculate fft unless we're plotting. Removes a lot of wasted computations.
Merge branch 'master' of git.gnuradio.org:gnuradio
grc: revert ce52bd370 fixes problem with order
grc: allow multiple ports with varying nchan
grc: fix port names (index relative to port type not absolute)
core: check if messages blocks are finished
grc: white background
grc: white blocks for nicer screenshots
blocks: add append option to file sink