Review overview slides

[dbosk]

The slides should be rewritten with a retake on access control. We should still cover some of the classical parts, but we should change focus so that the modern and outside-the-box parts are covered more extensively.

[dbosk]

From #11:

dbosk commented on 13 Mar 2017
Focus on the theory of access control, i.e. access control models. Then we can handle implementation in the refmon part.

dbosk commented on 13 Mar 2017
Perhaps merge lvlltrl into this theory. It's relevant to cover multilevel and multilateral security here too.

[dbosk]

Is this done? overview has been split in master.