cpu/sam3x: extend gpio implementation

kinetis_common: add a option to enable hardware CS for kinetis spi

xbee: add maximum packet size option

  minor fixes:
  - get rid of compiler warning "value 'SPI_1' not handled in switch"
  - add a giant macro to avoid redundant code in spi_init_master

drivers/periph/spi: added missing stdint.h include

ipv6_addr: do not null remaining bits in prefix initialization

Tests: Removing extra newline from Makefile.include

pktbuf: fix snip-was-head case for pktbuf_remove_snip

pktdump: add IPv6 header dump

pktdump: reply to netapi get/set

pktdump: dump data of packet snips structured

cpu/stm32f1: fixed GPIO interrupt cb arg handling

AODVv2: fix check if a route offers an improvement

tests/periph_gpio_exti: extend test to 32 GPIOs

- Removing the extra newline from tests-bloom, tests-crypto and
  tests-timex.

fix functions arguments

extended sam3x GPIO from 16 to 31

fix GPIO_NUMOF to 32

add GPIOs

extend GPIO 16-31  for ArduinoDue/UDOO

fix white space at the end  gpio_clear

drivers/xbee: declared private functions as static

AODVv2: rm unnecessary initialization of na_mcast

sys/shell: added missing return values for FIB command handler

netreg: ignore payload on default case in header build

Since some layers need to get options from their neighboring layers the
previous behavior is potentially stack breaking when testing with this
module since no reply is given to this requests, reply blocking the
requesting thread in the process.

pktbuf: add helper function to remove snips from packet

routing/aodv: added return on failed socket creation for receiver thread

rpl: update routing table information for all dodags

[RFC] ng_netif_hdr: add flags for multicast and broadcast