add name to sysconfig

there is still quite some space left on the persistent flash config area, make it possible to give nodes a name (e.g. hostname of the meshrouter) for nicer debugging
Merge pull request #632 from benpicco/add_name

add name to sysconfig
replace shell commands for different transceivers with one transceiver command
make transceiver get/set address type safe
replace uint16_t with radio_address_t in maca

adpots includes and makes them adhere to the coding conventions
replace uint16_t with radio_address_t in at86rf231

adpot includes
replace uint16_t with radio_address_t in cc2420

adpot includes
fix maca get_channel transceiver switch
Merge pull request #278 from LudwigOrtmann/transeiver_command

unify tranceiver shell commands