Tweakable madvise

[Guillaume Quintard]

I re-read some performance concerns about the file storage and remembered
that I said I'd send a patch, probably a year ago. So here we go.

The only thing it does is exposing the madvise parameter to the user, in
practice, it helps performance for big objects and/or rotational disk when
using MADV_SEQUENTIAL on Linux.

-- 
Guillaume Quintard
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