Revert "gnrc_uhcpc: fix dependencies"

boards: remove non-existent feature 'config'

cpu/stm32l0: implement i2C non blocking mode

boards: removed support for pca1000[0|5]

boards/wsn430: removed empty 'drivers' dir

drivers/mrf24j40: add peripheral requirements to Makefile dependencies

 drivers/nrf24l01p: misc fixed

boards/nucleo: removed duplicate features

boards/msp430-based: removed flashpage feature

This feature is already defined by the (common) CPU implementation,
so no need to re-define it for each board.

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>