#29: add additional object types (#395)

Author: Kraysent

postgres/migrations/V023__nature_additional_types.sql

@@ -0,0 +1,6 @@
+INSERT INTO nature.object_type VALUES
+  ('Neb', 'ism', 'Nebula')
+, ('PNe', 'ism', 'Planetary Nebula')
+
+, ('ext', 'src', 'Extended source')
+, ('.', 'src', 'Point source');