Also, `$instance` can actually be `null` internally.

Fixes for the remainder of lib/SimpleSAML

This way we can clear their state as well between tests, not only the configuration. This allows for richer functional testing.

Formatting, namespaces, phpdoc.

The data store can be a custom class in a module. When we cannot load a class matching the 'store.type' configuration option we don't handle the exception, causing a fatal error. Use the new CriticalConfigurationError to fix that. This fixes #369.

Removed a 'if' sentence than prevents a Store class couldn't be added if it is named with a namespace instead with the sspmod_<module>_Store_<class> way.

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@2619 44740490-163a-0410-bde0-09ae8108e29a

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@2492 44740490-163a-0410-bde0-09ae8108e29a

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@2490 44740490-163a-0410-bde0-09ae8108e29a