InputStream::readImage() : added info about which file failed to load when printing error message
InputStream::readImage() : added info about which file failed to load when printing error message

marchelbling/osg,marchelbling/osg,openscenegraph/osg,jtorresfabra/osg,marchelbling/osg,openscenegraph/osg,scrawl/osg,scrawl/osg,jtorresfabra/osg,openscenegraph/osg,marchelbling/osg,scrawl/osg,openscenegraph/osg,jtorresfabra/osg,jtorresfabra/osg,scrawl/osg