Merge pull request #17 from cpaasch/master

Fix some tests
It fixes #16 not merged modification on urgent pointers staed by PU. in test files
It fixes #15 issue, small modification
Computation on the specified dll and on the specified ssn. A test file is also added in dss folder named examples/mptcp/dss/dss_1pkt-999-FIN_to_kernel.pkt. This enhances the #18 request
Added an example of mp_fastclose option in mp_fastclose new created folder