GROMACS 2021.6 release notes

This version was released on TODO, 2022. These release notes document the changes that have taken place in GROMACS since the previous 2021.5 version, to fix known issues. It also incorporates all fixes made in version 2020.6 and earlier, which you can find described in the Release notes.

Fixes where mdrun could behave incorrectly

Fixes for gmx tools

Fixes that affect portability