update copyright info

[6LoWPAN] - Enforce aligned access

[6LoWPAN] - Added preceding out of bounds check

[6LOWPAN_LL] - Added initialisation routine and some documentation about the interface with device-drivers

[6LoWPAN] - Updated unit tests

[6LoWPAN] - Process pull request review

[6LoWPAN] - Improved interface with MAC-enabled device drivers. TODO: update units, check return types

[6LoWPAN] - Removed test-version of deriving link layer address. TODO: Implement 6LBR router behaviour in neighbor discovery so we can test address registration and link local address resolving.

[6LoWPAN] - Updated to pico_proto_###.alloc API

[6LoWPAN] - To central timeout-funcition, added init to stack-init

[6LoWPAN_LL] - Fix faulty dereference

[6LoWPAN-ND] - Reviewed neighbor discovery optimizations

[6LoWPAN-ND] - Proceedings in neighbor discovery optimizations

[6LoWPAN-ND] - Initial neighbor discovery optimizations

[6LoWPAN-LL] - Moved header processing to generic 6LoWPAN link layer

[6LoWPAN] - Unit test for fragmentation/reassembly