Major refactor to work like ICMPv6, which has a single checksum method that all inherit from.  Refactor echo and timestamp to be generic, comments
Major refactor to work like ICMPv6, which has a single checksum method that
all inherit from.  Refactor echo and timestamp to be generic, comments


git-svn-id: b3d365f95d627ddffb8722c756fee9dc0a59d335@117 64fbf49a-8b99-41c6-b593-eb2128c2192d

axsh/racket