[SQUASH ME] pktbuf: add diagnostic functions
[SQUASH ME] pktbuf: addressed comments
[SQUASH ME] pktbuf: parentheses overload
[SQUASH ME] pktbuf: make some internal macros inline functions
[SQUASH ME] pktbuf: make pktbuf_copy scope based
[SQUASH ME] parens-related coding conventions
Merge branch 'net-dev-base' into network-layer-interface
[SQUASH ME] basic_mac: addressed comments
Merge branch 'network-layer-interface' into uart_net
Merge branch 'packetbuf2' into uart_net