go_xref types that were missed somehow have now been added

sql/patch_54_55_b.sql

+# patch_54_55_b.sql
+#
+# title: Add missing GO_XREF types
+#
+# description:
+# Add missing GO_XREF enums that are missing
+
+ALTER TABLE go_xref MODIFY COLUMN linkage_type enum('IC','IDA','IEA','IEP','IGI','IMP','IPI','ISS','NAS','ND','TAS','NR','RCA','EXP','ISO','ISA','ISM','IGC');
+
+# patch identifier
+INSERT INTO meta (species_id, meta_key, meta_value) VALUES (NULL, 'patch', 'patch_54_55_b.sql|add_go_xrefs_types');
+
+ 
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