Bug 5630 CAS improvements

Bug 5630 CAS improvements

Squashed commit of the following:

commit 0e13a5278e11b288e48190dc26f31e96d06598dd
Author: Henri-Damien LAURENT <henridamien.laurent@biblibre.com>
Date:   Wed Jan 19 21:24:39 2011 +0100

    Bug 5630 : fixing C4/Auth.pm

commit b55abc7a0dc1ca43b2610a27246293e9a9346e18
Author: Matthias Meusburger <matthias.meusburger@biblibre.com>
Date:   Wed Jan 19 21:24:38 2011 +0100

    Bug 5630 : Adds CAS documentation

commit df0098a6a65465e6e734f99f65fb453dd3fa11d1
Author: Henri-Damien LAURENT <henridamien.laurent@biblibre.com>
Date:   Wed Jan 19 21:24:37 2011 +0100

    Bug 5630 : ilsdi service AuthenticatePatron doesn't with CAS syspref on

    Signed-off-by: Henri-Damien LAURENT <henridamien.laurent@biblibre.com>
commit 31c8f0c0facfafae011ad24c9d458c50f2fad296
Author: Matthias Meusburger <matthias.meusburger@biblibre.com>
Date:   Wed Jan 19 21:24:36 2011 +0100

    Bug 5630 : Adds the ability to authenticate against multiple CAS servers

commit 9d0def826135d5756533dc0dcf8e0a107d1ac8fc
Author: Henri-Damien LAURENT <henridamien.laurent@biblibre.com>
Date:   Wed Jan 19 21:24:34 2011 +0100

    Auth_with_cas : removing a warning

    $sth was defined twice in a function
    Removing the second definition

commit 5ee550e9a2bb7ab6bc09f14fced6ce0df8011eb0
Author: Matthias Meusburger <matthias.meusburger@biblibre.com>
Date:   Wed Jan 19 21:24:33 2011 +0100

    Bug 6012 : MT 2270: CAS proxy

    CAS Proxy
    Examples included are now really usable

    Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>