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
Replace '-' with '_' in BOARD and CPU_… macros
Fix BOARD macro
core:mutex: allow idle thread to use mutexes
use cpu dependent stack size
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.
fix ignore command
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
amendment to 169976f
make/buildtest: print errors

Display all stderr output but suppress warnings.

implements https://github.com/RIOT-OS/RIOT/issues/835
native profiling support

only works with Linux for now
change target name, add cachegrind target
rebase_fixup
make: streamline native targets

The new target names are easier to remember / decipher:

term
term-cachegrind
term-gprof
term-valgrind

all
all-cachegrind
all-gprof
all-valgrind
all-debug

eval-gprof
eval-cachegrind
add variables for gprof, cg_annotate
ipc_pingpong: start receiving thread immediately

Rationale: When using `msg_send_receive()` the receiving thread needs to
be already in receiving mode.