[RFC] Sane defaults for tmgr.atom_max_size

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Currently tmgr.atom_max_size defaults to 1/4 of RAM.
Historically RAM size increased faster than disk write speeds  so
machines today usually ship with 4-16GB of RAM that means that we can
get to situation where we have to flush 1-4GB of data and while doing
so system would be unresponsive for minutes for apps that wait on
sync.

If we presume an optimistic scenario of 100MB/s write speed and 10sec
wait time for 16GB RAM we come to the 1/16 ratio.

Your thoughts?

Dushan
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