Fixed so that the PVVDB.__format method actually _checks_ the fields

for a correct datatype.

lib/mdb/db.py

@@ -65,6 +65,8 @@ class PVVDB:
                 continue
             name, value    = line.strip().split(":", 1)
             value          = value.split("#", 1)[0].strip()
+            if not value in ['scalar', 'list']:
+                raise PVVDBError, "%s not legal .format datatype." % value
             fmt[name] = value
         return fmt