Revert "Fix the definition of RenameRelationInternal() for PostgreSQL 9.3"

  This fix was not correct for PostgreSQL 9.2.

This reverts commit 761ecbc4d0263523e750730597182d7f2c8f5241.
Fix the definition of RenameRelationInternal() for PostgreSQL 9.2 and PostgreSQL 9.3
Update documentations for pg_reorg 1.1.9