The process look for category, stamp and version to calculate
when to create a question or use a existing one.
This avoid duplicates in RANDOM and RANDOMSAMATCH qtypes.
question types.
And modified some of the quiz_answers restore system to
allow remapping answers with existing questions.
//Detected by scott dot elliott at mchsi dot com in Bug 84
- Teachers can backup/restore their courses.
- New option "restore to existing, deleting old".
- backupdata dirname harcoded.
- backup and restore buttons in main course page.
stronk7