Update utils and Makefiles for 8.1.1 and README doi
David Dickinson
Branch: minor/update_commits_for_8_1_1
Branch: 8.1.1-RC
Merged
Merged pull request
Merged in minor/update_commits_for_8_1_1 (pull request #598)
Merged in minor/update_commits_for_8_1_1 (pull request #598)
Updates the submodule commits and the zenodo link in the readme.