Added braces to highlight test and device names in log output.

- node configuration is usually independent from test configuration
- we might also want to aggregate multiple test directories to a full test suite
Thus a setup with 3 different config file types (nodes, tests, suite) is reasonable

New config option 'repeated' allows to force multiple runs of the same test.

This makes it possible to work also with an incomplete node set.

Conflicts:
	Makefile.include
	core/sys/profiling.c
	core/sys/test.h
	cpu/avr/Makefile.avr
	examples/wsn/Makefile
	platform/inga/contiki-inga-main.c
	tools/profiling/profile-neat.py
	tools/profiling/test/test.py

With the option one can add text to the graph label

The address in the AVR is given in words not in bytes. Previously the
script handled conversion, but doing it in Contiki should be cleaner.

This way we can still record useful debugging information like reset
reason.

Supply contiki as testcase classname as jenkins doesn't play nice with
an empty name

There was a problem where the test wouldn't retrieve all queue items
after all the threads were finished. This resulted in some of the
reports missing from the logs.

This hopefully resolves an issue where one device in a test didn't start
recording.

This is useful when testing something making small changes and rerunning
the test.

The devices now don't create an extra directory inside the test cases
which is much clearer now.

This makes sure that on directories are created for the tests that are
disabled.

* Include failure reason in the final report
* Return value now indicates how many tests failed

This fixed a problem in Ubuntu where avr-gcc did not find cc1

* TEST_REPORT can be used multiple times within a program in order to
  report metrics of different tests performed.
* TEST_PASS now takes no argument
* TEST_FAIL returns a failure reason
* Adapt the programs using it