Add "compile everything" tool

Having many tests is quite futile if they aren't executed once in a
while<sup>[citation needed]</sup>.

Alas, this is not the purpose of this PR. This PR adds the tool
"compile_test.py", which executes `make buildtest` for all applications
in `examples` and `tests`, and prints a comprehensive list of the
results.

redbee-econotag: fix maca

tests: fix test_hwtimer_spin

It contains the old test functionality of test_hwtimer_spin.

Actually test hwtimer_spin, not hwtimer_arch*

`hwtimer_wait` calls `hwtimer_spin` only for delays `<= 6`, that's why a
pure test_hwtimer_spin test should not pass values `>6`.
Also decrement delay in steps of 1.

native/make: add missing target

shell: Add doxygen

ccnl: find bogus looping content

Closes #577.

native: add help option

Closes: #840

Clean up test_irq

examples: ccn-lite blacklist boards

examples: rpl_udp: blacklist boards

pthread: implement reader/writer lock

Make: exterminate 'clean' buildtarget clutter

documentation: Add missing documentation for pthread functions and structures

I suspect that the transceiver will still not work as there are many
many warnings, but at least it builds now.

closes: #676

ccnl: use default transceiver

examples/rpl_udp: use defaulttransceiver

core: fix warning about discarding volatile

vtimer: fix integer overflow in vtimer_now() for MSP-430

posix:pthread c++11 changed pthread_self() to return thread IDs > 0

core: documentation: fix doxygen documentation in cib.h clist.h config.h tcb.h