Generalised the osgDB::Field so that its getFloat() method can be used with either doubles or floats governed by the type passed in - this helps support either float/double Quat and Matrix classes seemlessly.
Notes ===== The support in Image.cpp is also not full functional and should be rewritten in the future to support inline images. Currently osg::Images are supported via the osgDB::Registry::read/writeImage methods and plugins. Robert Osfield, March 2001.