Added preliminary file cache support.  Enabled by setting the OSG_FILE_CACHE variable.
Added preliminary file cache support.  Enabled by setting the OSG_FILE_CACHE variable.


tomasthoresen/osg,marchelbling/osg,artoolkit/osg,marchelbling/osg,marchelbling/osg,scrawl/osg,openscenegraph/osg,scrawl/osg,tomasthoresen/osg,marchelbling/osg,artoolkit/osg,artoolkit/osg,scrawl/osg,jtorresfabra/osg,scrawl/osg,openscenegraph/osg,artoolkit/osg,openscenegraph/osg,jtorresfabra/osg,jtorresfabra/osg,tomasthoresen/osg,jtorresfabra/osg,openscenegraph/osg,tomasthoresen/osg