Bump version

Add tag target to makefile

Fix up version

Two slashes for multiple substitutions in bash

Only display message every 1000 packet misses

Bump release version

Toss in the last timestamp seen for the packet as well

Updates service script of v2.1.1 to work under Ubuntu

Fixes v2.1 to work with linux 3.2.0

Release of PNA v2.1

- canonical IP ordering so internal flows are consistently tracked