Document and deprecate cURL wrappers

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@330269 c90b9560-bf6c-de11-be94-00142212c4b1
Don't inherit from DateTimeInterface

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@330270 c90b9560-bf6c-de11-be94-00142212c4b1