Feature #2758 SonarQube (1) (#2866) * test that this file is not needed anymore because RTD controls the version selector * various changes to appease SonarQube complaints * remove deprecated docker command * resolve more SonarQube code smells * update URL for posting sample data

Feature #2758 SonarQube (1) (#2866) * test that this file is not needed anymore because RTD controls the version selector * various changes to appease SonarQube complaints * remove deprecated docker command * resolve more SonarQube code smells * update URL for posting sample data #5224