More cleanup - move getenv() to SAPI

More cleanup...

More abstraction

Move the logging mechanism to SAPI

Fixed SAPI modules to properly register their related modules.

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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- Added flush() support to SAPI
- Got rid of the old flush() implemenetation in favour of the new one
- Added implicit_flush() support to the output buffering layer.
@- Added implicit_flu

- Added flush() support to SAPI
- Got rid of the old flush() implemenetation in favour of the new one
- Added implicit_flush() support to the output buffering layer.
@- Added implicit_flush() to control whether flush() should be called
@ implicitly after any output (Zeev)

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Move reentrancy initialisation/destruction into SAPI.
These calls only do something, if reentrancy emulation is required.

Happy Y2K patch! Happy new year (or the new millennium, depending on whether
you start counting at 0 or 1).

*** empty log message ***

not too bad: i can see phpinfo()!

SAPI module for phttpd - found at ftp://ftp.netuse.de/pub/phttpd/, ftp://ftp.signum.se/pub/phttpd/
(DOES NOT WORK YET!!)