Bug 24470: Mark a batch as 'imported' if all the bib has been imported

Bug 24470: Mark a batch as 'imported' if all the bib has been imported

When a staged MARC file is used to populate a basket in acquisitions,
the status of the batch is kept as "staged" until a user repeat the operation.
The "imported" status is added to the batch when new orders are added to
a basket "from a new file" (yes!...)

Test plan:
- Create a basket
- Add to basket From a New File
- Select a marc file and stage
- Add titles to your basket
Until all your records are imported the batch will have the status
"staged"
When all your records will be imported, the status of the batch will be
"imported"

Signed-off-by: Barbara Johnson <barbara.johnson@bedfordtx.gov>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>