boards/waspmote-pro: add support for Waspmote PRO v1.2

boards/waspmote-pro/Makefile

boards/waspmote-pro/Makefile.dep

boards/waspmote-pro/Makefile.features

boards/waspmote-pro/Makefile.include

boards/waspmote-pro/board.c

boards/waspmote-pro/dist/debug.sh

boards/waspmote-pro/dist/debug_srv.sh

boards/waspmote-pro/dist/gdb.conf

boards/waspmote-pro/include/board.h

boards/waspmote-pro/include/periph_conf.h

boards/waspmote-pro/include/waspmote_pinmap.h

cpu/atmega1281/Makefile

cpu/atmega1281/Makefile.include

cpu/atmega1281/cpu.c

cpu/atmega1281/doc.txt

cpu/atmega1281/include/cpu_conf.h

cpu/atmega1281/include/periph_cpu.h

cpu/atmega1281/lpm_arch.c

cpu/atmega1281/reboot_arch.c

cpu/atmega1281/startup.c