personal: Add Contact string represeantation

Change default string representation from "Dr. Henry Jeckyl" to "Jekyll,
Henry".

Add property method "name" to return the same representation.

Add property name_and_title to return name with title(s) included
("Jekyll, Dr. Henry, PhD MD")

mpicms/personal/models.py

@@ -136,9 +136,21 @@ class Contact(index.Indexed, models.Model):
         # index.SearchField('groups'),
     ]
 
+    @property
+    def name(self):
+        return ", ".join(filter(None, (self.last_name, self.first_name)))
+
+    @property
+    def name_and_title(self):
+        return ", ".join(filter(None, (
+            self.last_name,
+            " ".join(filter(None, (self.title, self.first_name))),
+            self.academic_suffix,
+        )))
+
     def __str__(self):
         if self.first_name or self.last_name:
-            return " ".join(filter(None, (self.title, self.first_name, self.last_name)))
+            return ", ".join(filter(None, (self.last_name, self.first_name)))
         else:
             return self.email