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ref https://git.openrobots.org/issues/274:
boost python is not available for python 2 in focal.

Tom Pillot authored Jul 23, 2020 and Guilhem Saurel committed Jul 23, 2020

Update .gitignore, Dockerfile, dashboard/settings.py, docker-compose.yml, dashboard/middleware.py, rainboard/management/commands/populate.py files
Deleted nginx/Dockerfile, rainboard/migrations/0045_example-adder.py, rainboard/migrations/0046_robotpkg.py, nginx/nginx.conf files

sleep a bit more after a mail, to avoid smtplib.SMTPConnectError: (421, b'4.3.2 Connection rate limit exceeded.')