Create Upgrade script

Author: stepan-neretin7

Makefile

@@ -26,7 +26,8 @@ DATA_built  = $(RELEASE_SQL) \
 			  pg_sphere--1.1.5beta2gavo--1.1.5beta4gavo.sql \
 			  pg_sphere--1.1.5beta4gavo--1.2.0.sql \
 			  pg_sphere--1.2.0--1.2.1.sql \
-			  pg_sphere--1.2.1--1.2.2.sql
+			  pg_sphere--1.2.1--1.2.2.sql \
+			  pg_sphere--1.2.2--1.2.3.sql
 
 DOCS        = README.pg_sphere COPYRIGHT.pg_sphere
 REGRESS     = init tables points euler circle line ellipse poly path box index \
@@ -256,6 +257,9 @@ pg_sphere--1.2.1--1.2.2.sql:
 	cat upgrade_scripts/$@.in > $@
 endif
 
+pg_sphere--1.2.2--1.2.3.sql:
+	cat upgrade_scripts/$@.in > $@
+
 # end of local stuff
 
 src/sscan.o : src/sparse.c

pg_sphere--1.2.1.sql.in

@@ -0,0 +1 @@
+-- Nothing to upgrade in the schema