Fix data corruption bug reported by robjderr (#1010664).

pg_reorg broke catalog definition if the target table had any dropped columns.
Now pg_reorg removes dropped columns and renumbers valid columns.
You can use pg_reorg to shrink column definitions if you have many dropped
columns. (without pg_reorg, dropped columns are filled with zero forever)

lib/pg_reorg.sql.in

@@ -83,7 +83,7 @@ $$
          ') = (' || $2 || '.' ||
          array_to_string(reorg.array_accum(quote_ident(attname)), ', ' || $2 || '.') || ')'
     FROM (SELECT attname FROM pg_attribute
-           WHERE attrelid = $1 AND attnum > 0
+           WHERE attrelid = $1 AND attnum > 0 AND NOT attisdropped
            ORDER BY attnum) tmp;
 $$
 LANGUAGE sql STABLE STRICT;