Fixed bug where python exception would be generated when both contour and vector display disabled.
Updated identify() to mesh with changes made to the crayfish view library's valueAtCoord function.
Made calls to QString in identify() QGIS version agnostic.
Added 'dummy' versions of rasterUnitsPerPixelX() and rasterUnitsPerPixelY() to allow profiletool to function.
Ensured layer properties window displays a sensible window title.