llsec: Added a layer in between NETSTACK_MAC and NETSTACK_NETWORK for implementing link layer security
llsec: Configuration option for defining a constant LoWPAN-wide security level
sky-main: Calling NETSTACK_LLSEC.bootstrap from contiki-sky-main.c
sky-main: DEBUG on/off switch
framer-802154: Style fixes
framer-802154: Defferring hdrreduce, so that an llsec_driver can access the entire frame
framer-802154: Support for creating and parsing frames with security headers
framer-802154: Support for setting and accessing the frame type
attribute
framer-802154: Sequence number fix
framer-802154: Renamed variable for the sake of consistency
framer-802154: Simplification of frame802154_create
framer-802154: Calling NETSTACK_LLSEC.on_frame_created()
framer-802154: Conditional compilation of security-related code
llsec: Hardware-independent interface to the symmetric-key
algorithms of 802.15.4
llsec: Reusable LLSEC_CCM.aes-based implementations of CCM*
llsec: Reusable functions for settings keys that are shorter
than 128 bits and for calling AES with plaintext blocks that are
smaller than 128 bits
llsec: Software-based llsec802154_ccm_driver
llsec: Disabled duplicate detection when the LLSEC driver provides replay protection anyway.
llsec: Noncompromise-resilient 802.15.4 security
'free_packet' in csma.c conflicted with 'free_packet' in maca.c