pothos-widgets: updateAxes after calls to setAxisScale
pothos-widgets: support rate and freq labels to modify settings
pothos-widgets: work on channel math for periodigram
pothos-widgets: work on 2d planar select widget
pothos-widgets: working plane selection implementation
pothos-widgets: planar select docs and display tweaks
pothos-widgets: added click select, moved pos math
Merge branch 'master' into periodigram_work
pothos-widgets: added averaging factor to the periodigram
pothos-widgets: working legend checkbox for min/max hold
pothos-widgets: clear min/max hold on become visible
pothos-widgets: planar select gets a title
pothos-widgets: wave monitor legend checkbox and common code