backend: object filtering:
- add filtering crawls, crawlconfigs and profiles by userid= query arg, fixes#460
- add filtering crawls by crawlconfig via cid= query arg, fixes#400
- tests: add test_filter_results test suite to test filtering crawls and crawlconfigs by user, also create user with 'crawler' permissions, run second crawl with that user.
* Use archive_viewer_dep permissions to GET crawls
* Add is_viewer check to archive_dep
* Add API endpoint to add new user to archive directly (/archive/<id>/add-user)
* Add tests
* Refactor tests to use fixtures
* And remove login test that duplicates fixtures