fix recv_rpl_dio, missing return, refactor
reset context before makecontext call, check

check return value of swapcontext
replace 1 with EXIT_FAILURE in all err calls
add in_isr sighndl safeguard
mitigate against signals when signals are off
mask all signals in signal handler
rework sigmasks

only mask signals actively being used
always enable shutdown
added a transceiver independent ignore function
check for transceiver module before auto_initializing cc1100 driver
removed superfluous parameter in rpl_send()
making the pedantic gcc happy
removed unused parameter of internal get_udp_socket()
removed unused len parameter for borderrouter demultiplex()
tiny debug improvement for RPL
debug output when joining a dodag
fix grammar in license header
fix native board license headers
GNU Lesser General Public License -> LGPLv2
fix rpl_find_preferred_parent
improve valgrind section