Merge pull request #22 from authmillenon/disable-debug

stm32f103rey6: Disable debug in stm32f103rey6-hwtimer.c
select the correct configuration file
use BOARD variable in debug script
call fw_puts for stdout in _write
Merge pull request #24 from OlegHahm/syscall_stdout_fw_puts

stm32f103rey6: call fw_puts for stdout in _write
Merge pull request #23 from OlegHahm/flash_cmd_board

stm32f103rey6: select the correct configuration file
Use new GET_CPU_ID macro
Define link-local address initialization specific macros