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A first stab at a default configuration system

Cleanup and fixes

Cleanup and refactorization of the STM32w port

Use stderr for logging to avoid polluting stdout.
Add some DEBUG tracing.

Since we will hopefully one day use stdout as a CTK display,
use stderr instead for log output, which can be redirected to a file.

* Fix shell_exit() signature, it's called without any argument.

Allow IPv6 to be compiled via #define

Improvements to the core/net/ code

Network system bugfixes

Regression tests: split the collect test into two, moved armgcc download location

Major bugfix: when nullrdc is asked to send a list of packets, send the list of packets and not just the first packet - this is essential for retransmissions of fragmented IP packets to work

This is a general cleanup of things like code style issues and code structure of the STM32w port to make it more like the rest of Contiki is structured.

core/net: Added support for "bridge mode".

Add mesh_ready() to mesh

Defensive programming: make sure that we don't fail completely if we get a callback for a NULL pointer

Bugfix: keep track of receiver being awake as a local variable rather than a global, as it may have changed between invokations

New mechanism for computing the 6lowpan header length dynamically, depending on how large header the framer creates. Also check the incoming packet for buffer overflow.

* add a few rimestats to keep track of sent and received acks
* made a number of configuration options possible to override (ack timing)
* added the logic for sending 802.15.4 link layer ack packets, despite not being able to guarentee the 802.15.4 MAC timing
* increased the number of sequence numbers to keep track of for duplicate filtering

Changed the name of the IPv6 number of route entries configuration from UIP_CONF_DS6_ROUTE_NBU to UIP_CONF_MAX_ROUTES.

The contiki-default-conf.h file is intended as a safe fallback for
a number of configuration options in Contiki, to avoid putting too
much in the individual contiki-conf.h files.

Added #if UIP_CONF_IPV6 around the IPv6 code in the uIP source tree to allow the C files to be compiled even if IPv6 is not configured.

Separated the uIP makefile from the top-level Makefile.include into a separate core/net/Makefile.uip makefile

travis build complete faster.

Also changed the armgcc download link to a github location.

Fix a syntax error in cpu/cc253x/dev/uart0.c

[ci] Travis needs 32-bit compatibility libraries

Restored build in cmd.exe environment.

Restored build in cmd.exe environmet by re-applying change https://github.com/contiki-os/contiki/commit/f3cf57e41b277beebd353a4d76aba2359868b361 which was reverted recently.

Miscellaneous small DNS resolver updates and fixes