pothos-widgets: work adding center freq to plotters
pothos-library: added buffer chunk append call
pothos-blocks: use buffer chunk append in Deserializer
pothos-gui: add safety check for combobox edit widget
pothos-library: accumulate when requirement is larger than the actual buffer
pothos-widgets: drop down combobox for num FFT bins
pothos-widgets: added center freq to spectrogram
pothos-widgets: simplfy wave plotter axis update
Merge branch 'plotter_center'
pothos-blocks: enumerated options list for pacer data type
pothos-blocks: added label id support to blocks
Merge branch 'master' into sporadic_labeler

Conflicts:
	pothos-widgets/WaveMonitor/WaveMonitor.hpp
pothos-widgets: wave monitor plots labels as markers