From Brede Johansen - Fixes to osg::Plane::valid and added a new set method.

From Stephan Huber - Compilation fix to Texture.cpp for OSX.

From Don Tidrow - added dirtyBound() to osgText::Text::setPosition

src/osgText/Text.cpp

@@ -268,6 +268,7 @@ void Text::
 setPosition(const Vec3& pos)
 { 
     _pos=pos;
+    dirtyBound();
 }
 
 void Text::