[finefs] Performance enhancement

[amaury]

From the beginning, FineFS' daemon was a program designed to be
managed by Xinetd. Readings and writings were done over STDIN and
STDOUT. It's a common, well-known technic.

But Xinetd adds an overhead. So we've developed a new standalone
daemon.
I updated the benchmark page (http://code.google.com/p/finefs/wiki/
PerformanceDB).

Here are the results (in second, less is better):
Writing: 0.0287793 (xinetd)
Writing: 0.0018507 (standalone daemon)

10+ times faster!
FineFS was already faster than Memcache on readings, but now it has
quite the same writing performance.

We will commit this new daemon very soon, and it will be a part of the
next release.