remove typenames and queryables for outputschemas without an official profile

Per #118.  Notes:

- outputschemas are now extensible in `pycsw/plugins/outputschemas`
- outputschemas are enabled by default, always
- Atom support breaks the current OGC CITE tests (CITE tests for CSW assume Atom is an invalid `outputschema` value).  Email sent to CITE forum to fix this issue
- `pycsw/plugins/profiles` now only has official and supported/current OGC CSW application profiles
- most of the changes in this PR are updates to the unit tests (namespace declarations)