Improved Debug

Signed-off-by: Christoph Paasch <christoph.paasch@uclouvain.be>
Fix: Support receiving DSS without CSUM - even if it has been negotiated.

RFC 6824, Section 3.3:
If a checksum is not present when its use has been negotiated, the
receiver MUST close the subflow with a RST as it is considered broken.

Signed-off-by: Christoph Paasch <christoph.paasch@uclouvain.be>
Update version-info

Signed-off-by: Christoph Paasch <christoph.paasch@uclouvain.be>