remove superflicious enumaration

- fix potential buffer problem in send_cookie
- fix gc probability algorithm
- don't access mod_data directly
- initial version of mm support for session data storage

This work

- fix potential buffer problem in send_cookie
- fix gc probability algorithm
- don't access mod_data directly
- initial version of mm support for session data storage

This works pretty good, but we need to create the initial mm pool
from the parent process/thread. Still looking for a clean way to do that.

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- add session.extern_referer_chk
- use combined lcg in session id creation

we don't need php_sid

that should be included 1st

implement a simple API in the case someone wants to define his/her own serialization stuff

Added session expiration.

Added session_is_registered(varname) function.

* Fix a buglet in the session module
* Make some renames in the session module - avoid having a function called 'delete'
so that we don't piss any C++ compilers. Also rename the {startup,s

* Fix a buglet in the session module
* Make some renames in the session module - avoid having a function called 'delete'
so that we don't piss any C++ compilers. Also rename the {startup,shutdown}_globals
to {startup,shutdown}_session_globals, so that they're a bit less general names,
and made them static.
* Remove uselss variables

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- some cleanups
- add gc logic
- add session_destroy()

- s/encoded/encode/
- new TODO entry

first import of session module