Refactor for a bit more safety
Add hacky AUT multiplicity for denoting automatically computed relations
Merge pull request #14 from AmpersandTarski/add-AUT-property

Add aut property
Use --test for interface documentation
First version of documentation for messages

(Add "CLASS Message" after an interface name to classify it as a message interface) @stefjoosten: expression and definition will probably not both fit in the table, so we have to make a choice or think of some other presentation.
Only create messages chapter if there are message interfaces
Show interface name in message table in bold