moved debugging statements from header to c file

Additionally, declaring the stacks as static.
amendment - to be squashed
tests: add test that shows sequence of received messages
test_thread_msg_seq: add missing main() return statement
core:mutex: allow idle thread to use mutexes
Add test if the message queue is fair
use cpu dependent stack size
use forwarding table entry when routing

So far the entry was looked up, but ignored in the case where the packet
has to be forwarded.
added missing hdr position shift
shell: accept UTF8 input
shell: don't ignore IO errors
shell: add myself to authors
Ensure that stack pointer is correctly aligned during thread creation on MSP430
make/buildtest: print errors

Display all stderr output but suppress warnings.

implements https://github.com/RIOT-OS/RIOT/issues/835
ipc_pingpong: start receiving thread immediately

Rationale: When using `msg_send_receive()` the receiving thread needs to
be already in receiving mode.
posix: move posix semaphore in posix module
rename test for posix semaphore
correct copyright and doxygen
Merge pull request #866 from Kijewski/add-test-queue-fairness

Add test if the message queue is fair
Merge pull request #845 from mehlis/sem-to-posix

posix: move posix semaphore in posix module