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this adds a package for utility tool called tunslip6 from the Contiki OS for estabilishing a SLIP connection over USB to an attached Contiki device for 6LoWPAN connectivity. Signed-off-by: Markus Becker <mab@comnets.uni-bremen.de> git-svn-id: svn://svn.openwrt.org/openwrt/packages@31165 3c298f89-4303-0410-b956-a3cf2f4a3e73