- I user has basket grouping permissions, don't display javascript popup for confirmation
- if user has basket grouping permissions, after closing the basket redirect him to a page which asks which basketgroup to affect the basket to (with possibility to create a new basketgroup)
- when done with this, redirect him to basketgrouping.pl to be able to print the basketgroup at once
- factor out basket closing code from booksellers.pl (what was it doing there anyways?)
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