heap_fetch requires buffer pointer, must be released; heap_getnext

no longer returns buffer pointer, can be gotten from scan;
	descriptor; bootstrap can create multi-key indexes;
pg_procname index now is multi-key index; oidint2, oidint4, oidname
are gone (must be removed from regression tests); use System Cache
rather than sequential scan in many places; heap_modifytuple no
longer takes buffer parameter; remove unused buffer parameter in
a few other functions; oid8 is not index-able; remove some use of
single-character variable names; cleanup Buffer variables usage
and scan descriptor looping; cleaned up allocation and freeing of
tuples; 18k lines of diff;

src/backend/executor/spi.c

@@ -466,7 +466,7 @@ SPI_gettype(TupleDesc tupdesc, int fnumber)
 	}
 
 	typeTuple = SearchSysCacheTuple(TYPOID,
-				 ObjectIdGetDatum(tupdesc->attrs[fnumber - 1]->atttypid),
+					 ObjectIdGetDatum(tupdesc->attrs[fnumber - 1]->atttypid),
 									0, 0, 0);
 
 	if (!HeapTupleIsValid(typeTuple))