Metadata before compiling and its handling

This adds default values to default metadata and the option to set it
before compiling the protocol (i.e. while planning to TO).
Additionally, the (dynamic) metadata fields are handled correctly in the
ProtocolForm and metadata is shown while still planning.
Additionally, protocol.start_time is used instead of
protocoltype.usual_time.

/close #47
/close #65
/close #106

auth.py

@@ -131,8 +131,7 @@ class ADManager:
             for group_dn in result.memberOf:
                 group_dn_parts = parse_dn(group_dn)
                 if len(group_dn_parts) >= 1:
-                    for group_dn in group_dn_parts:
-                        key, group, next_char = group_dn
+                    key, group, next_char = group_dn_parts[0]
                     yield group
 
     def all_groups(self):