examples/default: set src addr correctly
examples/default: fix handling of 802.15.4 devices
shell/transceiver: fix byte selection for 802.15.4 devices in output
sys/transceiver: cleanup and fix for cc2420 and at86rf231

cc2420: the payload pointer was set twice
at86rf231: payload_len was not copied from the radio driver buffer
make: fix the order of Makefile.dep for timex

The order of modules in Makefile.dep matters.
make: fix dependencies

uart0 depends on POSIX, not the other way around.
posix: configure stdio only to uart0 if enabled
Merge pull request #1674 from thomaseichinger/default_fix

examples/default:sys/transceiver: fix for 802.15.4 radio devices
boards/iot-lab_M3: fix PORT
Merge pull request #1754 from OlegHahm/timex_makefile_order

make: fix the order of Makefile.dep for timex
Merge pull request #1773 from thomaseichinger/fix_iot-lab_term

boards/iot-lab_M3: fix PORT for TERM