Merge pull request #258 from karlp/pulls/dead-examples-1

[examples] Remove broken example with no clear purpose
Removed obsolete file.

I wrote:
> Moved from last cc65 release (2.13.3) to recent cc65 snapshot (2.13.9).
> [...]
> Atari:
> - The builtin linker config allows to override the start addr so there no more need for a custom linker config.
> [...]
However I didn't actually remove the custom linker config not needed anymore.
Merge pull request #260 from oliverschmidt/master

Removed obsolete file.
Added platform 'Atari XL'.

Don't be afraid, I'm not trying to have more retro platforms than "real" platforms ;-)
The platform 'atarixl' will replace the platform 'atari'. However I need both for some
transition period.
Merge pull request #261 from oliverschmidt/master

Added platform 'Atari XL'.
Another small addition for platform 'Atari XL'.
Merge pull request #263 from oliverschmidt/master

Another small addition for 'Atari XL'.
Style fixes
NETSTACK_LLSEC: New layer in between NETSTACK_MAC and NETSTACK_NETWORK for implementing link layer security
NETSTACK_LLSEC: Doing hdrreduce in NETSTACK_LLSEC, so that the NETSTACK_LLSEC driver can
see the entire frame
NETSTACK_LLSEC: Configuration option for defining a constant LoWPAN-wide IEEE
802.15.4 security level
NETSTACK_LLSEC: Calling NETSTACK_LLSEC.bootstrap from contiki-sky-main.c
framer-802154: Support for creating and parsing frames with security
headers
framer-802154: Support for setting and accessing the frame type
attribute
framer-802154: Sequence number fixes
CC2420: Doing CRC in hardware all the time
CC2420: Macros as functions for saving program memory
CC2420: CC2420_WRITE_RAM with parameterizable ordering + resulting
simplifications
CC2420: The crystal oscillator only needs to stabilize on startup
CC2420: Securing outgoing frames by using the hardware-acceleration
capabilities of the CC2420