Sam Hemelryk 85008bedd5 MDL-41106 cache: several fixes for the session cache.
This issue makes several fixes for the session loader and the session store.
 * maxsize argument now works for session caches.
 * fixed performance hole when interation occurs frequently.
 * fixed cache purge bug occuring when multiple caches are defined before being used.
 * improved lastaccess handling.

Big thanks to Marina who contributed the following commits:
 * Always make sure the elements in cache are sorted so we need to remove only elements in the beginning of array
 * Remove expired elements from session store to free memory
 * Minor bug fixes
2013-08-26 09:15:57 +12:00
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