Allow IEEE 802.15.4 addressing types for transceiver

[miri64]

IEEE 802.15.4 has two addressing modes: 16-bit short and the device's
EUI-64. Currently RIOT supports only sending of packets with 16-bit
short addresses via the transceiver interface. This patch allows at
least for the radio chips that support IEEE 802.15.4 to let the
application/upper layer decide which addressing mode to use.

Upper layer implementation will be implemented in follow-up PR to #460 so for now ccn and sixlowpan will not work with this PR

Note: there are some coding convention fixes included in this PR.

[OlegHahm]

In file included from sc_cc2420.c:5:0:
/home/oleg/git/RIOT/examples/default/../../sys/net/include/ieee802154_frame.h:76:1: warning: `packet' attribute directive ignored [-Wattributes]
sc_cc2420.c: In function `_cc2420_send_handler':
sc_cc2420.c:99:14: error: `ieee802154_packet_t' has no member named `data'
sc_cc2420.c:101:14: error: `ieee802154_packet_t' has no member named `dst'
sc_cc2420.c:104:83: error: `ieee802154_packet_t' has no member named `dst'
sc_cc2420.c:104:99: error: `ieee802154_packet_t' has no member named `data'

when building default for wsn430-v1_4.

And what about all these empty new lines?

[LudwigKnuepfer]

@LudwigOrtmann add native support

[OlegHahm]

ACK - merge as soon as follow-up PR to #460 is ready.

[miri64]

Last push rebases code, uses macros for IEEE address mode tests and adds some error handling

[mehlis]

I'm happy about the styling changes, but please make them in its own commit :) - because more than 30% of the lines are style changes.

[miri64]

@mehlis done + rebased

[OlegHahm]

Just for clarification: this is not yet meant to be merged because #460 follow-up is still missing, right?

[miri64]

@OlegHahm right.

[mehlis]

part of #644

[OlegHahm]

Reviewed (tests will follow as part of #644 testing): ACK

[LudwigKnuepfer]

use filter instead