Bug 15096: Export today's checked in barcodes: Display warning if reading history...

 Bug 15096: Export today's checked in barcodes: Display warning if reading history is set to "never"

If a patron's privacy settings are set to "Never" for keeping a reading history, "Export today's
checked in barcodes" returns an empty file. This patch does not allow to export in such case.

To test:

- Apply patch
- Check out / check in in some items

-Test toolbar:
- On user's detail page, go to More->Export today's checked in barcodes
- Verify that the menu item does not appear if syspref 'intranetreadinghistory'
  is set to 'Don't allow'
- Verify that the menu item appears if syspref 'intranetreadinghistory'
  is set to allow and
  - that the menu item is grayed out with a tooltip if the user has set privacy
    settings to never keep a reading history
  - that the menu item works as before if user's privacy settings allow reading history.

- Test left tab "Circulation history":
- Verify that the left tab "Circulation history" does not appear if syspref
  'intranetreadinghistory' is set to 'Don't allow'
- Verify that the tab appars if syspref 'intranetreadinghistory' is set to 'Allow' and
  - that a message appears if user's privacy settings do not allow to keep the reading history
  - that the export works as before if user's privacy settings allow to keep the reading history

(Amended and changed test plan for comment #9)

Signed-off-by: Aleisha <aleishaamohia@hotmail.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Brendan A Gallagher <brendan@bywatersolutions.com>