Products.memcachedmanager

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* Remove cmemcache support
Add pylibmc support
Optimized cache lookup code
[tesdal]

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* Get rid of the entry list. For invalidation we bump
a counter instead.
[tesdal]

* Use pickle protocol 2.
[tesdal]

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* Mirror invalidation support
[tesdal]

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* Repackage MemcachedManager as an egg.
[wichert]

* Remove old style test setup and update it to current conventions.
[wichert]