Merge branch 'mj-opraveno' into 'devel'

db/db.ddl

db/upgrade-20220115.sql

etc/config.py.example

mo/db.py

mo/email.py

mo/jobs/__init__.py

mo/jobs/notify.py

mo/place_level.py

mo/rights.py

mo/users.py

mo/web/menu.py

mo/web/org_contest.py

mo/web/org_round.py

mo/web/org_users.py

mo/web/templates/doc_org.html

mo/web/templates/org_contest.html

mo/web/templates/org_contest_edit.html

mo/web/templates/org_contest_solutions.html

mo/web/templates/org_contest_task.html

mo/web/templates/org_generic_list.html