OverlayDecorator/ClampingTechnique: reduce jittering by optimizing the near/far planes in the ortho RTT projection matrix. Disable auto clip plane calculation on the ClampingTechnique RTT camera.
Integration PolygonizeLines into the GeometryCompiler; update Stroke to support it; update Units to parse value+units strings like "10m" or "25px".
merge
Merge branch 'master' of github.com:gwaldron/osgearth
QuadTree driver: patch PIXEL_SIZE_ON_SCREEN rangeMode by using the bounding sphere radius.
OverlayDecorator: use an earth-minor radius for the area determination
Draggers.cpp: fix gcc compile error