Bug 11759: (QA followup) Sysprefs should be kosher
The introduced syspref was defined before we added new guidelines
for them. This patch puts them in sync with current standards. It also
splits them into:
- A big on/off switch (BatchCheckouts)
- Patron category filter (BatchCheckoutsValidCategories)
The latter is expected to go away if we move this into a boolean column
on the 'categories' table, which seems a better approach. I'm filling a
new bug for this last comment.
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>