Upgraded phpCAS to 1.1.2 and fixed https://issues.jasig.org/browse/PHPCAS-73 ,
as reported by Fred Woolard in MDL-23126 (the fix will be in upstream in the
next release)
Credit goes to Johan Reinalda.
Also make sure phpCAS doesn't try to start a new PHP session. We have already
started our own and want to keep it :). In addition to it, it emitted a PHP
notice that could block the authentication process under certain
configurations.
And pretty much the same with the wantsurl and loginguest checks.
Inaki