Add the 'D'-modifier to all regex'es that match the full string.

By default '$' matches end of string, or newline at end of string,
which made it possible to add a trailing newline to some strings that
shouldn't have it.

As far as I can tell, none of the errors presented a security problem.

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@2183 44740490-163a-0410-bde0-09ae8108e29a