[SQUASH ME] basic_mac: address comments
[SQUASH ME] basic_mac: address more comments
[SQUASH ME] basic_mac: one rename more

https://www.youtube.com/watch?v=-qkf0fLU2Ao
Merge branch 'basic_mac' into HEAD
ipv6: Initial import of address module
ipv6: Initial import of IPv6 interfaces module
ipv6: Initial import of the reworked IPv6 module
[SQUASH ME] ipv6: continue implementation and specification
[SQUASH ME] ipv6.addr: add ipv6_addr_init_prefix function

+ make iphc_cbuf dependend on ipv6_addr
[SQUASH ME] ipv6: better checksum handling
[SQUASH ME] ipv6: more stuff
[SQUASH ME] ipv6: specify internal sending functions
[SQUASH ME] ipv6: upper layer registry functions
[SQUASH ME] ipv6: start implementation of control thread
[SQUASH ME] ipv6.if: add MTU
[SQUASH ME] ipv6: more ignores