Add \x0 at the end of filename/dirname.
Nodes in the tree are hashs!
Add an option to quiet the program.

This option only works for messages displayed while
calculating checksums on files. If -n or --noprint
is invoked then the program doesnt print anything
when checksuming files.
Document test I've done with blocksize

On a near 5 Gigabytes corpus I have the following :

Blocksize Intra_Dedup_bytes Percentage
8192      275493246         5.51
16384     262609025         5.25
32768     224175882         4.48
Can not parse huge files for now

Everything is still in memory so we can not parse big files
for now. I have to make a cache somewhere.
New group and key for a cache directory.
Reading from configuration file "cache-directory" option