Added check to deal correctly with out of order ACKs during fast recovery
moved call to change state to fast recovery before rexmit which could block
Merge pull request #20 from balrajsingh/master

fix for the Dubious ACK msg that was occasionally seen
Reuse the same cstruct for some header info in chksum calc
Added a simple profiler to time various function.
Merge pull request #21 from balrajsingh/master

checksum fix and added a simple profiler
Merge github.com:mirage/mirage-net
fixing the manager intf on socket backend