* restructured cpu folder to distinguish between arm and lpc common files
* initial not yet compiling(!) support for mc1322x
* added header and preliminary hwtimer code for mc1322x
* renamed start to startup
* clean up stuff (fix gcc warnings and added clean target for doc)
* split up syscalls in arm and lpc specific code
* added startup code for mc1322x
* mc1322x specifics syscalls
* changed httimer_arch_init() to init all 4 timers and added implementation for hwtimer_arch_set
added implementation of htimer_arch_set_absolute()
implemented hwtimer_arch_(enable|disable)_interrupt() and added ITC definitions
* added proper "struct TMR_struct*" in hwtimer_cpu.c
* removed dublicate definition of the UART structure in mc1322x.h
embedded mc1322x radio API into transceiver.{c,h}
Implement simple echo request/reply
_sbrk_r was moved to arm_common/syscalls.c -> added fix for __heap_* variables for mc1322x
added set_pan and get_pan for mc1322x maca
fixed merge conflicts