Updates for OCI8 2.0, Oracle 12c (including mentioning the Oracle oraaccess.xml configuration & auto-tuning file), and the Windows OCI8 2.0 DLLs.  Also various small clarifications from my todo list.

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@331735 c90b9560-bf6c-de11-be94-00142212c4b1