Bug 11014 - Slip Print Problem in Chrome

Currently, slips cannot be printed in circulation, members, or the
self check out when using Chrome.

This patch adds a timer of 1ms which allows Chrome's custom code to
prevent "window.close" occuring before the user has dealt with the
print window.

This patch also allows admins to use the 'IntranetSlipPrinterJS'
system preference to override the slip printing code by centralizing
all the slip printing code in slip-print.inc, and including this JS
anywhere it's needed in the staff client.

I haven't used this include in the OPAC SCO but perhaps it would make
sense to do so as well (even if it isn't referred to in the syspref's
name).

_TEST PLAN_
1) Using Chrome on Windows (not sure if this is an issue on other OSes),
try to print a slip in the following locations:

Fines Tab -> Print button
koha-tmpl/intranet-tmpl/prog/en/modules/members/printfeercpt.tt:

Details tab -> Print button -> Print slip || Print quick slip
koha-tmpl/intranet-tmpl/prog/en/modules/members/moremember-receipt.tt:

Details tab -> Print button -> Print summary
koha-tmpl/intranet-tmpl/prog/en/modules/members/moremember-print.tt:

Fines tab -> Accounts tab -> Print (Manual invoice of $5 sundry)
koha-tmpl/intranet-tmpl/prog/en/modules/members/printinvoice.tt:

Checkout tab -> Print button
koha-tmpl/intranet-tmpl/prog/en/modules/circ/printslip.tt:

Finish button
koha-tmpl/opac-tmpl/bootstrap/en/modules/sco/printslip.tt

2) Note that each time you try to print, a new print page is created
but closed before you have a chance to print.

3) Apply the patch

4) Repeat Step 1

5) Note that the print page now doesn't close until after you've
chosen to print or cancel.

Signed-off-by: Christopher Brannon <cbrannon@cdalibrary.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>