1. Merged ARG_INFO patch (Felipe)

1. Merged ARG_INFO patch (Felipe)

2. Allow an empty username/password to be passed so Oracle can do
non-password based authentication, i.e. "External Authentication".
http://news.php.net/php.internals/37545

[DOC]

A new OCI_CRED_EXT flag can be passed as the "session_mode" parameter
to oci_connect(), oci_new_connect() and oci_pconnect().

  $c1 = oci_connect("/", "", $db, null, OCI_CRED_EXT);

This tells Oracle to do external or OS authentication, if configured
in the database.

OCI_CRED_EXT can only be used with username of "/" and a empty
password.  Oci8.privileged_connection may be On or Off.

The new flag may be combined with the existing OCI_SYSOPER or
OCI_SYSDBA modes (note: oci8.privileged_connection needs to be On for
OCI_SYSDBA and OCI_SYSOPER mode), e.g.:

  $c1 = oci_connect("/", "", $db, null, OCI_CRED_EXT+OCI_SYSOPER);