Traumflug

From 5b2b31156771fd48fe7db0812547396e335a005c Mon Sep 17 00:00:00 2001
From: Markus Hitter <mah@jump-ing.de>
Date: Mon, 28 May 2018 23:37:21 +0200
Subject: GDPR: make DOKU_PREFS cookie a session cookie.

We could probably let it expire after a year for permanently
logged in users, but it looks like this requires quite some code.
Only the authentication cookie knows wether the login is a
permanent one, so we'd have to query that one.

Traumflug

From 9a236e8c15b86bbfaaa39ccdef7bb0ea12406a5f Mon Sep 17 00:00:00 2001
From: Markus Hitter <mah@jump-ing.de>
Date: Fri, 4 Dec 2015 19:08:08 +0100
Subject: Spam protection: require user-agent to be set.

While it's easy to set the agent, some spammers don't, so do this
simple check to reject them. All legitimate users are expected to
actually use a browser, so the field is set and they won't notice
the distinction.
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