Add type column to external_db.

sql/patch_43_44_c.sql

+# patch_43_44_c
+#
+# title: Add type column to external_db
+#
+# description:
+# Add a column for the type of the xref (array or whatever) to external_db
+
+ALTER TABLE external_db ADD COLUMN type ENUM('ARRAY', 'ALT_TRANS', 'MISC', 'LIT');
+
+# patch identifier
+INSERT INTO meta (meta_key, meta_value) VALUES ('patch', 'patch_43_44_c.sql|external_db_type');
+