 0.4 Public release
 - Added documentation
 - Added packetp_set_type()
 - Added packetp_set_target()
 - Added packetp_set_proxy()
 - Added packetp_set_verbose()
 - Added packetp_set_simplified()
 0.3 Private release
 - Renamed to packet purgatory
 - Added PP_LOOPFW mode
 - Code reworked to NetBSD style guide style
 0.2 Private Release
 - Added simplified mode
 - Reworked tunnel structure
 0.1 Private Release
 - libtunnel initial release
