The master branch is the Sakai 12 version.
11.x branch is for Sakai 11.
Sakai10 Branch is the one needed for Sakai 10.
Student numbers are supported in the Report interface, and are provisioned through LDAP using the CandidateDetailProvider in Kernel.
This is a boolean value, which defaults to false and controls whether student numbers are enabled system wide.
This is a boolean value, whose default is false, which controls whether or not student numbers are enabled.
certification.extraUserProperties.enable = true