Bug 36475: Enable table configurations on patrons print summary

Bug 36475: Enable table configurations on patrons print summary

This patch fixes table configuration to the tables shown on the
patron's print summary page, adding default display length and default
sort as well.

I removed the JS for moving around the DataTable controls to make them
display better and instead swapped the <caption>s for <h2>. It's not
perfect but it's better than it was.

Previously table configuration wasn't working because the window.print()
function was firing before the DataTables code had time to run. I've
added a use of onbeforeprint event to make sure we run the DataTables
initiation before automatic printing.

To test, apply the patch and restart services.

- In the staff client, go to Administration -> Table settings ->
  Circulation -> print_summary.
  - Configure the print-summary-checkouts, print-summary-fines, and
    print-summary-holds tables with some custom options (e.g. hide
    columns, change default sort).
- In the staff client, find a patron with checkouts, holds, and fines.
- In the toolbar, click Print -> Print summary. A new tab should appear
  with the print summary view. A print dialog should appear immediately.
- In the print preview you should see that the tables you configured are
  displayed correctly (sort is correct, columns correctly hidden, etc).
- If you print the page or cancel the tab should close.

- If you want to test the table configurations without having the tab
  automatically close you can go to Administration -> System preferences
  -> IntranetSlipPrinterJS and enter any dummy code, e.g.
  "console.log('Testing');" With that preference populated, the
  automatic closing isn't included.

- Test other pages which use the slip-print include, e.g. other patron
  print options and quick spine labels in Cataloging.

Sponsored-By: Athens County Public Libraries
Signed-off-by: Thibaud Guillot <thibaud.guillot@biblibre.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>