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enrollments. The goal for this PR is to have a single mechanism for registering users and reducing the number of places where special-casing for ccx courses is needed. The migration at this point is purposefully limited to convert ccx memberships into student enrollments when moving forward. No backward migration is in place at the moment. The ccx membership tables are not removed at this time. It is possible to go backwards and forwards multiple times with no errors or data loss.
Open edX -------- This is the root package for Open edX. The intent is that all importable code from Open edX will eventually live here, including the code in the lms, cms, and common directories. Note: for now the code is not structured like this, and hence legacy code will continue to live in a number of different packages. All new code should be created in this package, and the legacy code will be moved here gradually.