Require uniqueness in the name/comment field of delegations

Fix error reporting in the UI to include the detailed message
Sort delegations by name when displaying them
Update the name field from "Name" to "Delegation Name"

ipa-admintools/ipa-adddelegation

@@ -90,6 +90,25 @@ def main():
         new_aci.dest_group = target_grp[1].dn
         new_aci.attrs = attr_list
 
+        aci_entry = client.get_aci_entry(['*', 'aci'])
+
+        # Look for an existing ACI of the same name
+        aci_str_list = aci_entry.getValues('aci')
+        if aci_str_list is None:
+            aci_str_list = []
+        if not(isinstance(aci_str_list,list) or isinstance(aci_str_list,tuple)):
+            aci_str_list = [aci_str_list]
+
+        for aci_str in aci_str_list:
+            try:
+                old_aci = ipa.aci.ACI(aci_str)
+                if old_aci.name == new_aci.name:
+                    print "A delegation of that name already exists"
+                    return 2
+            except SyntaxError:
+                # ignore aci_str's that ACI can't parse
+                pass
+
         aci_entry = client.get_aci_entry(['dn'])
         aci_entry.setValue('aci', new_aci.export_to_string())