Added two sections to the documentation which still need to be documented

doc/index.rst

@@ -17,6 +17,8 @@ Contents:
    Action Language <actionlanguage>
    Modelling Language <modellanguage>
    Wrappers <wrappers>
+   Model representation <model>
+   Permission system <permissions>
    Common problems and solutions <problems>
    Interfaces <interface>
    Internals <internal>

doc/model.rst

@@ -0,0 +1,4 @@
+Model representation
+====================
+
+Documents the internal model representation and provides remarks.

doc/permissions.rst

@@ -0,0 +1,24 @@
+Permission system
+=================
+
+Presents the permission system and explains administrator privileges.
+
+Model permissions
+-----------------
+
+Explain the UNIX-like system we implemented.
+
+Meta-level propagation
+^^^^^^^^^^^^^^^^^^^^^^
+
+Explain how a model might become unreadable in some context, based on the permissions of its metamodel.
+
+Group permissions
+-----------------
+
+Explain how groups work and the reason for their owners.
+
+Administrators
+--------------
+
+Explain use of administrators and what they can do.