tools/licenses: add 3c-BSD-atmel3 pattern
tools/licenses: add 3c-BSD-nordic pattern
license: added missing license for msp430 time.h
tools/licenses: remove unused 3c-BSD-clark
cpu/board: update stale redbee license headers
tools/licenses: add 1c-BSD-stanford pattern
drivers/cc2420: use DEBUG_ENABLED instead of DEBUG

compare https://github.com/RIOT-OS/RIOT/issues/2067
Merge pull request #2065 from LudwigOrtmann/issue-392

license header + pattern cleanup
Merge pull request #2068 from LudwigOrtmann/debug-enabled

drivers/cc2420: use DEBUG_ENABLED instead of DEBUG
pkg/libcoap: call "$(MAKE)", not make
test/coap: update blacklist for features

Boards that don't have a transceiver are automatically filtered out already.
Merge pull request #2077 from LudwigOrtmann/libcoap-make

pkg/libcoap: call "$(MAKE)", not make; tests/coap: update blacklist
dist/licenses: add and use diff-filter
dist/licenses: add and use --error-exitcode
Merge pull request #2072 from LudwigOrtmann/license-difffilter

dist/licenses: add and use diff-filter
RIOT/Makefile.include: added variable `EXPECT_CONFLICT` to be used for indicating possibe conflicting features.
- For instance using `SPI0` and `DAC0` on the `stm32f4discovery` at the same time

The variable should be set in the board `Makefile.features`
[SQUASH ME or REMOVE ME] added small test