[Opm] OPM release 2021.10, release candidate 1

[Atgeirr Rasmussen]

Dear all,

The first release candidate for OPM release 2021.10 is now available for testing.
It is available as binary packages for Ubuntu Linux versions 18.04 and 20.04. To test
the binary packages, follow the normal installation instructions at the OPM website,
https://opm-project.org/?page_id=245, but replace the command

sudo apt-add-repository ppa:opm/ppa

with the command

sudo apt-add-repository ppa:opm/testing

to use the testing package repository instead of the regular one.

Atgeirr