Merge branch 'issue/solver_tolerance' into 'develop'

typo in parameter key for absolute solver tolerance

See merge request !96
Status Job ID Name Coverage
  Test
canceled #8705
debian:10 clang-6-libcpp-17

canceled #8704
debian:10 gcc-8-17

canceled #8706
debian:9 gcc-6-14

canceled #8707
ubuntu:18.04 clang-6-17