added example in main

ClassInfo(QObject).setLabel(label)
ClassInfo(QObject).__str__()
changes to ClassificationScheme(QObject) (clear, saveToRaster)
ClassificationSchemeTableModel, ClassificationWidgetDelegates

ClassInfo, ClassificationScheme, ClassificationSchemeTableModel, ClassificationSchemeWidget and ClassificationSchemeDialog

refactoring

renamed fileSizeString to scaledUnitString

cleanup, refactoring,smaller fixes

toggle crosshair visibility for for all mapviews, selected mapviees, single map canvases

added logging
TsvMapCanvas.setshowCrosshair + context menu actions related to this

static CrosshairDialog.getCrosshairStyle(*args, **kwds)

crosshair can show the pixel boundaries of underlying top-most raster layer

added logging
removed "findAbsolutePath"