Mutiple changes to REST code. Requesting an invalid attribut via rest/data/class/id/attrib used to return a 405, it now returns a 400 and a better error message. /rest/ response scans the registered endpoints rather than using a hard coded description. So new endpoints added in interfaces.py are listed. Fix a number of Allow headers that were listing invalid methods. Also when invalid method is used, report valid methods in response. Extract methods from Route list. Fix Access-Control-Allow-Methods. Add X-Requested-With to Access-Control-Allow-Headers. Add decorator openapi_doc to add openapi annotations for the rest endpoints. Added a couple of examples. Returning this info to a client is still a work in progress.