[ENSCORESW-752]. Patches for:

- schema version change: 74 --> 75
- addition of source column to transcript table.

sql/patch_74_75_a.sql

+# patch_74_75_a.sql
+#
+# Title: Update schema version.
+#
+# Description:
+#   Update schema_version in meta table to 75.
+
+UPDATE meta SET meta_value='75' WHERE meta_key='schema_version';
+
+# Patch identifier
+INSERT INTO meta (species_id, meta_key, meta_value)
+  VALUES (NULL, 'patch', 'patch_74_75_a.sql|schema_version');

sql/patch_74_75_b.sql

+# patch_74_75_b.sql
+#
+# Title: Add source to transcript
+#
+# Description: Column allowing an optional source to be added to a transcript
+
+ALTER TABLE transcript ADD COLUMN source VARCHAR(20) NOT NULL;
+
+# Patch identifier
+INSERT INTO meta (species_id, meta_key, meta_value)
+  VALUES (NULL, 'patch', 'patch_74_75_b.sql|transcript_source');
+
+