[PATCHES] shared snapshots release 17

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Hi

New shared snapshots are here. It incorporates Mike's changes and it has 
reworked memory limit:
- a minimum of 8 buffers is guaranteed to prevent thrasing with too big 
chunk sizes
- the cache for multisnapshots is limited to 2% of memory or 25% of 
vmalloc memory (whichever is lower) [ I'm thinking about making this 
configurable in /proc ]
- big chunk sizes (8MB or more) allocate memory always from vmalloc, there 
is no point in allocating from general allocator

Mikulas

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