I (Marcus Green) am no longer maintaining this plugin, but there is an alternative plugin that covers a very similar functionality which can be found here https://github.com/marcusgreen/moodle-report_advancedgrading
Add setting and code for showgroups. Thanks to Dan Marsden for the idea and code
Respect the blindmarking setting
Fix the showstudentid setting to show/hide studentid in the output.
Added support for BTEC Grading plugin. Codechecker compliance.