nbgrader
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Add raw cell support
This PR adds support for "raw" cells in assignments. Without this fix the user gets an SQLAlchemy error during the release of an assignment which contains a notebook with a "raw" cell. Raw cells now work the same way as markdown cells.
Fixes #921
Thanks @KrKOo for opening this. Can you please rebase on main, a #1928 should have fixed the unrelated test failures.