Change version column in xref to be default 0, not null.

sql/patch_39_40_c.sql

+# patch_39_40_c
+#
+# title: xref version 
+#
+# description:
+# Change version column in xref to be default 0, not allow null
+
+ALTER TABLE xref CHANGE COLUMN version version VARCHAR(10) DEFAULT '0' NOT NULL;
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+UPDATE xref SET version = '0' WHERE version = NULL OR version = '';
+
+# patch identifier
+INSERT INTO meta (meta_key, meta_value) VALUES ('patch', 'patch_39_40_c.sql|xref_version');
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+# Similarly make all seq_region_start & seq_region_end columns INT(10) UNSIGNED
+# Although these are not used as keys, they are used in many joins and having
+# the same column type should make joins faster as MySQL will not have to do
+# any type casting.
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