Merge branch 'mj/stavy-souteze' into 'devel'

bin/create-contests

db/db.ddl

db/upgrade-20210308.sql

mo/db.py

mo/imports.py

mo/jobs/submit.py

mo/rights.py

mo/web/org_contest.py

mo/web/org_round.py

mo/web/org_score.py

mo/web/templates/org_contest.html

mo/web/templates/org_contest_edit.html

mo/web/templates/org_round.html

mo/web/templates/org_submit_list.html

mo/web/templates/org_user.html

mo/web/templates/user_contest.html

mo/web/templates/user_contest_task.html

mo/web/templates/user_index.html

mo/web/user.py

static/mo.css