Add a fix to TDFDataSource for the case of requesting windowed data if window function == none.  This can happen when viewing a "scatterplot" and zooming out to large genomic intervals.  To support window function "none" would require loading all the underlying data.   For now switch to "mean" in this case,  should revisit later.
Add a fix to TDFDataSource for the case of requesting windowed data if window function == none.  This can happen when viewing a "scatterplot" and zooming out to large genomic intervals.  To support window function "none" would require loading all the underlying data.   For now switch to "mean" in this case,  should revisit later.

git-svn-id: b5cf87c434d9ee7c8f18865e4378c9faabe04646@537 17392f64-ead8-4cea-ae29-09b3ab513800

amwenger/igv,godotgildor/igv,godotgildor/igv,igvteam/igv,godotgildor/igv,igvteam/igv,igvteam/igv,amwenger/igv,itenente/igv,amwenger/igv,amwenger/igv,godotgildor/igv,amwenger/igv,godotgildor/igv,itenente/igv,igvteam/igv,itenente/igv,itenente/igv,itenente/igv,igvteam/igv