Revert #173d556ea9ce46099187d9df65fffd426b8442c1
- Had broken idempotence of scriptlevel IDs
Revert #173d556ea9ce46099187d9df65fffd426b8442c1
- Had broken idempotence of scriptlevel IDs
Merge pull request #1218 from code-dot-org/fix_script_levels

Revert #173d556ea9ce46099187d9df65fffd426b8442c1 to fix ScriptLevel import idempotence