Vector sink has unusable marker lines

[tpiepho-synapse]

The VectorDisplayPlot has two marker lines, named LowerIntensityLevel and UpperIntensityLevel. They default to visible, yet these is no way to make any use of them, as neither the vector_sink interface nor the vector_sink_f_impl class provide any interface to them.

Seems like they should default to off, or just be removed, if there is no way to ever give them a value other than zero.

[marcusmueller]

That's right, still no way to manipulate these things from gr::qtgui::vector_sink

Should be removed:

• The slots
• the setters
• the underlying variables