Add collapse_deleted_comments as a parameter to set_settings. Fixes #333.
Fix #340. Add warning to OAuth document.

Also added other minor documentation changes.
Actually add the other minor documentation changes.
Fix #174. Support modconfig scope in get_stylesheet.
Use monotonic clocks everywhere
Version bump to 2.1.19.
Enable HTTPS everywhere.
Fix test_scope_read_get_submission_by_url test.
Make 3.0a1 version.