Bug 11559: Supporting changes for Rancor

Bug 11559: Supporting changes for Rancor

  * Extends login screen to pass along #hash
  * Adds JSONP support to C4::Service
  * Extends humanmsg to allow per-message classes
  * Adds proper charset to results of svc/bib

Test plan:

  1. C4/Auth.pm and .../intranet/.../auth.tt: verify that login/usage
     works as expected, despite the change to pass on the fragment (...#blah)
     from the URL.
  2. C4/Service.pm and humanmsg.js: verify that editing system
     preferences (the main user of these modules) works correctly despite
     updates.
  3. svc/bib: verify that records can be correctly downloaded with the
     change of character set. This can be done in a Firebug/Chrome Devtools
     console by running `$.get('/cgi-bin/koha/svc/bib/1')` and inspecting the
     results (possibly replacing 1 with a different valid biblionumber).

Signed-off-by: Nick Clemens <nick@quecheelibrary.org>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>