Modified the response error response code returned in STOU when there's a REST pending (see Issue #19). Instead of returning "550" (permanent filesystem related error) we return "450" (temporary filesystem related error) instead.
Modified the response error response code returned in STOU when there's a REST pending (see Issue #19). Instead of returning "550" (permanent filesystem related error) we return "450" (temporary filesystem related error) instead.

giampaolo/pyftpdlib