Morphing experiments
Detail texture
Add osgEarthUtil::DetailTexture
add noise tex
Make mp the default terrain engine
Merge branch 'master' into topic-morphing
Experiments in LOD morphing with elevation_tile_size
merge master
Fix compile error after master merge
merge
Merge branch 'master' into topic-morphing

Conflicts:
	src/applications/osgearth_viewer/osgearth_viewer.cpp
	src/osgEarthDrivers/engine_mp/MPTerrainEngineNode.cpp
	src/osgEarthDrivers/engine_mp/TileModelCompiler.cpp
	src/osgEarthUtil/CMakeLists.txt
	tests/feature_tfs.earth
	tests/readymap.earth
merge