.DEFAULT_GOAL was reset many times which removed 'all' from being the default
goal.
By chance it was then set to `link` so was working by some magic.

Makefile.include: refactor command present check

makefiles: FIX boards generating a binary '.hex' file

netdev: Initial implementation of a more layered approach to netdev

ethos: add periph_uart as dependency

gnrc_netreg: fix static PID initialize for gnrc_netapi_callbacks

* Use the existing variable when possible
* Remove duplicate definition
* Remove unused BINFILE variable

Refactor the code checking if command is present.
Message is taken from the compiler check as it was more precise than the others.

make: replace curly braces with parenthesis

sys/phydat: align numbers, remove index if dim == 1

cpu/samd21: Avoid clearing interrupt bits unintentionally

cpu/atmega1284p: support and boards/mega-xplained: support

The INTENSET, INTENCLR, INTFLAG registers are write-1-to-confirm
registers, so writing zeroes will not affect anything, on the other
hand, a compiler generated read-modify-write cycle may unintentionally
affect more bits than the one being set. Avoid by using direct
assignment instead of or-assignment (|=) or bitfield writes (.bit.xxx=).

drivers/sx127x: make paselect configurable in the driver params

core/mutex: fix -fpermissive warning in C++ mode

g++ gives the error message "error: invalid conversion from ‘void*’ to
‘list_node*’ [-fpermissive]"

native: remove non required NATIVEINCLUDES

 sys/phydat: Add phydat_fit to rescale values for phydat_t

Fits larger values into the 16 bit integers used by phydat_t and update scale accordingly.
Including a minimal unit test.

Fits larger values into the 16 bit integers used by phydat and update
scale accordingly.

bindist: remove APPLICATION_MODULE duplicate

Fix APPLICATION_MODULE being duplicated in the command line during link.

This error is currently silently ignored by the linker.

pkg*: replace curly braces by parenthesis in makefiles

drivers/cc2420: apply unified driver params scheme

drivers/soft_spi: move to drivers_periph group

boards/nucleo-l152: increase xtimer backoff