Add detection for recursive decompression bombs

[srehm]

The idea is to build a set containing the hashes of already extracted archives along each filesystem branch. If a new archive is detected that is already present in the set, it will not be extracted a second time.

This solves cases like in issue #50.

[pombredanne]

Thanks! let me review this in details! We would need a DCO and is there a tiny test archive we can craft too?

[pombredanne]

I forgot that we have the quine as test archives!

[srehm]

Added DCO