- Improve startup speed a bit by using the hash_*_ptr() functions

- Change the argument order of php_register_variable() to something more
intuitive.
- Make the authentication variables be a part of the HTTP_SERVER_VARS[] array

- A few fixes
- Added register_argv_argc directive to allow disabling of argv/argc

Tried to centralize global variable registration as much as possible:

- Added $HTTP_ENV_VARS[] and $HTTP_SERVER_VARS[] support, which similarly
to $HTTP_GET_VARS[], contain environment

Tried to centralize global variable registration as much as possible:

- Added $HTTP_ENV_VARS[] and $HTTP_SERVER_VARS[] support, which similarly
to $HTTP_GET_VARS[], contain environment and server variables. Setting
register_globals to Off will now also prevent registration of the
environment and server variables into the global scope (Zeev)
- Renamed gpc_globals to register_globals (Zeev)
- Introduced variables_order that deprecates gpc_order, and allows control
over the server and environment variables, in addition to GET/POST/Cookies
(Zeev)

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