blocks: fixed probe_signal_vx vector utilisation
Merge branch 'master' into next
ctrlport: updated examples for controlport use.
core: changed PC get functions to return instantaneous value. Average values now use _avg suffix on functions (like _var before).
ctrlport: new performance monitoring tool using networkx and matplotlib.
Merge branch 'next' of gnuradio.org:gnuradio into next