fixing the versioning problem. Up until now if we found no version in a class we...

fixing the versioning problem.  Up until now if we found no version in a class we 'assumed' it was the latest (1.5.0) - this is dumb.  No version really means it is probably 1.2.0 (as the version was added for 1.2.1).  These fixes mean that you can now safely check that version when reading in attributes, confident that checking for 1.5.0 *means* 1.5.0 was used to build it.