Bug 16513 - Improvements and fixes for quote upload process

Bug 16513 - Improvements and fixes for quote upload process

This patch fixes some minor bugs and adds a small enhancement to the
quotes editor and quotes upload pages.

To test, apply the patch and go to Tools -> Quote editor

- In the table of quotes, clicking the "ID" table header should trigger
  an alert, "Click on the quote's ide to select..."
- Go to "Import quotes" and select a file to upload.
- On the upload preview page you should see a new "Cancel import"
  button. Clicking it should return you to the quotes upload page after
  asking for confirmation.
- Test the upload cancel button:
  - If you have fast reflexes or are uploading a file large enough, you
    should be able to see a "Cancel upload" button during the upload
    process.
  - Clicking this button should cancel the upload and return you to the
    quote upload page.

Tested on top of Bug 16589, works as expected.
Signed-off-by: Marc Véron <veron@veron.ch>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>