removing possible invalid check

Checking for a link local address to determine if a node is on-link is
probably not a valid assumption in most wireless networks.
native: don't use RIOT read/write in UART
Added standard way to query CCA status on CC2420 transceiver (squashed)
Completed CC2420 constants documentation (DOxygen)
Handle race conditions preventing timers to be set correctly on MSP430 MCUs
when the counter is incrementing and/or overflowing
Fixed error caused by non-inclusion of cc2420_txrx() prototype
Fixed implementation of channel_clear() function
Change year of file copyright
Merge pull request #957 from rousselk/hwtimer-msp430-handle-overflow

Handle race conditions preventing MSP430 timers to be set correctly
cpu: satisfy compiler in crash.c
Make: fix linebreaks in buildtest
Merge pull request #892 from OlegHahm/crash_noreturn

cpu: satisfy compiler in crash.c for ARM and MSP430
Fix for WSN430 1.4 driver
fixup for #710: use subfolder in bin dirs (native)

Update native Makefiles to provide changed object target paths
Fixes #989
Merge pull request #992 from LudwigOrtmann/fixup_710

fixup for #710: use subfolder in bin dirs (native)
Merge pull request #873 from OlegHahm/on_link_check

net: sixlowpan: removing possible invalid check
Fix length of fragmentation buffer in 6LoWPAN
Merge pull request #870 from authmillenon/fragbuf

sys:net:sixlowpan: Fix length of fragmentation buffer in 6LoWPAN
Merge pull request #915 from rousselk/radio-cca

Add a standard way to query CCA status on CC2420 transceiver.
Merge pull request #946 from Kijewski/native-write

native: don't use RIOT read/write in UART