Fix size of the reported "buffers/cache" memory. #54
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It now reports only reclaimable memory, by excluding shared memory,
and including the reclaimable part of the SLAB cache.
So '$mem' with 'no_buffers yes' is now the "really used" (unreclaimable) memory.
And when reaching OOM conditions, conky will always report high memory usage.
Related post:
http://calimeroteknik.free.fr/blag/?article20/really-used-memory-on-gnu-linux