Upgrade notes for simpleSAMLphp 1.9
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* The OpenID client "linkback" URL has changed from `.../module.php/openid/consumer.php` to `.../module.php/openid/linkback.php`.
* Support for CA path validation has been removed from SAML 2.0.
* The X-Frame-Options has been added to the default templates, to prevent the pages from being loaded in iframes.
* Access permissions of generated files are now restricted to the current user.
* The code to set cookies now requires PHP version >= 5.2. (PHP version 5.2.0 or newer has been the only supported version for a while, but it has in some cases been possible to run simpleSAMLphp with older versions.)
* It used to be possible to set an array of endpoints for the SingleSignOnService in `saml20-idp-hosted.php`. That is no longer supported.
* The `aselect` module has been replaced with a new module. The new module gives us better error handling and support for request signing, but we lose support for A-Select Cross.
* There has been various fixes in the session exipration handling. As a result of this, sessions may get a shorter lifetime (if the IdP places a limit on the lifetime, this limit will now be honored).
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