updated for new netmap API
commented out debug printing to stderr
latest netmap header files
Merge pull request #4 from djnz00/debug_printing_cleanup

commented out debug printing to stderr
Merge pull request #6 from djnz00/latest_netmap

updated for new netmap API
note supported netmap API revisions
update buildrump
remove unused variable
linkstr fixes; really need to update libvirtif to latest version
teach receive about multiple rx rings, needed for hardware interfaces
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