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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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better scaling for large servers using many session ids

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

- Fix PSLS issues
- Add a standard info function for the session module (use them!)
- Replace PATH_MAX with MAXPATHLEN (that's our platform indepedent constant)

one C too much

avoid unnecessary PSLS_FETCH() in internal functions

-Init tsrm on minit

- Use PS() everywhere.

- Make sessions compile on win32 but it still doesn't link.

- Add some *_FETCH()'s. Still some work to be done so that it'll compile on win32.

- s/encoded/encode/
- new TODO entry

add some protos

add some thoughts

- auto startup when calling register
- auto startup using a configuration option

moving start code into its own function

SAPI does not want line endings

first import of session module