pkg/u8g2: update version

tests/pthread*: adapt to testrunner scripts

cpu/stm32l0 : implementation of ADC driver

ADC configuration added for nucleo-l073 board

Signed-off-by: Aurelien Fillau <aurelien.fillau@gmail.com>

Now, ADC is available on stm32l0 family. A calibration is
done at each new adc_sample. Moreover, when conversion is done,
VREFINT and temperature sensor are dactivated to save power.

Signed-off-by: Aurelien Fillau <aurelien.fillau@gmail.com>

kinetis: Add support for LPUART module in parallel with UART module

[OpenThread] report RSSI for openthread

tmp006: optional raw values, low power mode, SAUL type

dist/tools/edbg: clear INCLUDES and LINK env vars before building

drivers, at86rf2xx: cleanup

    - update documentation
    - adapt constness
    - fix code alignment and stlye

This fixes compilation on macOS. Without this, autoconf
might pick up INCLUDES and LINKER variables causing compilation
and linking errors.

tests/thread_basic: rename python testrunner script

tests/driver_at86rf2xx: fix var lengths and unused vars

examples: only whitelist a few essential boards (dirty hack)

This is a dirty hack proposed by @kaspar030 offline (with slight
adaptations) to allow Murdock to build properly tonight. @kaspar030
revert if the issue is fixed, @miri64 close this one if it isn't merged
tonight.

Right now Murdock fails randomly for some boards, because it doesn't has
the `xxd` tool installed.

    - at86rf2xx_tx_prepare
    - at86rf2xx_set_state
    - at86rf2xx_set_option

tests/thread_*: migrate to testrunner script