qtgui: added qtgui_freq sink for reals and GRC files for freq sinks.
Merge branch 'master' into next
Merge branch 'master' into next
fcd: update to use new gr-filter blocks
Merge branch 'next' into wip/filter-rm-next
Merge branch 'master' into next

Conflicts:
	gnuradio-core/src/lib/general/CMakeLists.txt
qtgui: adding a stand-alone constellation plot form with menus.
qtgui: adding PSD and constellation static plot tools.
fft: adding a malloc for doubles.

In core for master, also exporting symbols for use externally.
qtgui: using volk to handle conversion/decomposing float/complex to double buffers.

Adding an unaligned 32fc_deinterleave_64f_x2 volk kernel to support this.
Merge branch 'master' into next
Merge branch 'next' into wip/filter-rm-next

Conflicts:
	gnuradio-core/src/lib/swig/CMakeLists.txt
qtgui: adding stand-alone waterfall form/plots.
qtgui: added block tree file for qtgui to better organize blocks.
qtgui: added spectrogram static plot and updated others.
qtgui: added freq sink specific menu item to adjust the fft size.
qtgui: added setting/resetting of FFT size and averaging.
qtgui: added setting/resetting of FFT size for waterfall plots.
qtgui: bug fixes to time plots.
core: adding ability to change and reset skiphead parameters.