Minor Fixes in GenericNetworkConfigurator and TransportProtocolBase

Signed-off-by: Florian Meier <florian.meier@koalo.de>
DSSS-OQPSK-16 Modulation taken from MiXiM

Signed-off-by: Florian Meier <florian.meier@koalo.de>
IEEE 802.15.4 Narrowband Physical and Link Layer

Default settings for the MAC are taken from the 802.15.4-2006 standard.
Uses BreakpointPathLoss taken from 802.15.4-2006 Standard Annex E.
Default radio settings are taken from the datasheet of the ATmega256RFR2.

Signed-off-by: Florian Meier <florian.meier@koalo.de>