Implement FR #41146 - Add "description" with exteneded flag pg_meta_data().
pg_meta_data(resource $conn, string $table [, bool extended])
It also made pg_meta_data() return "is enum" always.
Merge branch 'PHP-5.6'

* PHP-5.6:
  Implement FR #41146 - Add "description" with exteneded flag pg_meta_data(). pg_meta_data(resource $conn, string $table [, bool extended]) It also made pg_meta_data() return "is enum" always.