Tile stitching, no-data rejection and other features updated to work with oe2.5 RC5.
Remove extra SkyNode constructor.
Commit upstream changes.
Remove some GDAL_SCOPED_LOCKS.
Replace some GDAL_SCOPED_LOCKs with Dataset specific locks.
NO_DATA_VALUE checking.
Modify OverlayDecorator for underground & Trackball Manipulator.