destiny: wireshark revealed wrong seq/ack nr. in tcp handshake
Capturing the tcp handshake with wireshark revealed that the
sequence and ack nrs. are not rfc compliant.
I did the changes based on
http://tools.ietf.org/html/rfc793#page-52 to http://tools.ietf.org/html/rfc793#page-72
make / cortex m: replace hyphen in module name

When you compile for UDOO, you are greeted by a multitude of this
warnings:
```
<command-line>:0:14: warning: ISO C99 requires whitespace after the macro name [enabled by default]
```

The reason for that is the argument `-DMODULE_CORTEX-M3_COMMON`.

This PR fixes this problem by replacing hyphens with underscores for the
`-D…` argument.
boards: harmonise cc2420 isr

TelosB, wsn430-v14, Z1
Merge pull request #1304 from thomaseichinger/fix_cc2420_rxfifo_of

boards: harmonise cc2420 isr
Merge pull request #1346 from Kijewski/hyphen-in-modulename

make: cortex m3: replace hyphen in module name
Merge pull request #1301 from cgundogan/fix_tcp_handshake_seq_ack_rfc_compliancy

destiny: wireshark revealed wrong seq/ack nr. in tcp handshake
Initial commit of Arduino Mega2560
strip functions in atmega2560/periph and atmega_common/thread_arch.c down to prototypes

Add custom errno.h since avr-libc doesn't include one
rename board_init to main, main to o_main (inside hello-world/main.c). Fix
Makefile.include:

UART works within RIOT codebase, :)
Develop: fix invocation of avrdude
arduino-mega2560: cleanup, add interrupt driven uart communication
SQUASHME: return examples/hello-world/main.c to original state
Arduino Mega2560: Make reset_handler entry point and move ISR to startup.c

    Create .init7 and .init8 sections to circumvent call to main
    Move ISR for UART0_RX to startup.c
    Some cleanup
Arduino Mega 2560: remove instrumentation from board_init()
Arduino Mega 2560: move logic from board_init() to reset_handler(), cleanup
Arduino Mega 2560: cleanup, remove unnecessary delays, add catchall loop for
debugging
Arduino Mega 2560: remove dummy main function and set entry point to
reset_handler to fix linking
Arduino Mega 2560: add Macros to get and set the global interrupt flag
Arduino Mega 2560: add atomic_arch_set_return to atomic_arch.c
Arduino Mega 2560: add arch specific implementation of functions to enable, disable and set the global interrupt flag, missing: function to see if in ISR