sparse_disp: extra debugging info, split gridding test
sparse_disp: extra debugging info, split gridding test

Add a bit more debugging info, perform separate tests for adequate number of points and for whether the points are all in the same row/column

NeoGeographyToolkit/StereoPipeline,ScottMcMichael/StereoPipeline,oleg-alexandrov/StereoPipeline,DougFirErickson/StereoPipeline,aaronknister/StereoPipeline,njwilson23/StereoPipeline,oleg-alexandrov/StereoPipeline,ScottMcMichael/StereoPipeline,aaronknister/StereoPipeline,NeoGeographyToolkit/StereoPipeline,njwilson23/StereoPipeline,aaronknister/StereoPipeline,ScottMcMichael/StereoPipeline,DougFirErickson/StereoPipeline,oleg-alexandrov/StereoPipeline,DougFirErickson/StereoPipeline,oleg-alexandrov/StereoPipeline,DougFirErickson/StereoPipeline,aaronknister/StereoPipeline,oleg-alexandrov/StereoPipeline,NeoGeographyToolkit/StereoPipeline,oleg-alexandrov/StereoPipeline,njwilson23/StereoPipeline,DougFirErickson/StereoPipeline,aaronknister/StereoPipeline,NeoGeographyToolkit/StereoPipeline,ScottMcMichael/StereoPipeline,NeoGeographyToolkit/StereoPipeline,NeoGeographyToolkit/StereoPipeline,njwilson23/StereoPipeline,njwilson23/StereoPipeline,ScottMcMichael/StereoPipeline,njwilson23/StereoPipeline,ScottMcMichael/StereoPipeline,DougFirErickson/StereoPipeline