Fix too short 6LoWPAN reassembly timeout
[avr] Removed usage of deprecated MCUSR

Since avr-libc 1.8.0 MCUSR is marked as poison as it was replaced by the
correct name MCUCSR.
Thus code still using the old MCUSR name does not compile anymore.

This commit replaces usages of former MCUSR by its new name MCUCSR and
modifies the alias fallback accordingly.
llsec: Renamed ccm to ccm_star & Renamed llsec regression test
[cooja-platform] Include eeprom.h to avoid implicit declaration warning
[cooja-platform] Remove unused variable 'shortaddr'

This variable was set but never used in the code
[cooja-platform] Add cast to linkaddr_t to avoid warning
[cooja-platform] Fixes for slip-bridge compatibility

* Added dev/uart1.h header file to cooja platform
* Added slip arch stub
* Suppress examples putchar definition as cooja platform provides its own

Note that the uart1.h file should only be an intermediate solution.
A generic contiki-wide definition for uart handling is required as each
platform defines its own varying set of uart functions.
Button: Move common interface visualization to Button class

The implementation of a simple JPanel with a JButton was only code
duplication accross the several button implementations.
SkyButton: Reduce dependency on SkyMote

Placed call to setButton() in implementation-specific functions
doPressButton() and doReleaseButton() as in ContikiButton.
Button: None of the buttons will saves its state

Saving a buttons state in simulation file is not required as its state
is much too volatile.
Button: Add doPressButton() and doReleaseButton() to Button class

As every Button has a node-specific implementation part, this should be
the minimal interface to the backend node emulator for pressing and
releasing a button.
Buttons: Move implementation of button routines to Button class

The implementation of clickButton(), pressButton(), and releaseButton()
can be shared accross the several node-dependent implementations as
they use the node-dependent doPressButton() doReleaseButton() routines.
Buttons: Added missing @Override annotations
Buttons: Some minor cleanups

Removed imports not required anymore and made some class members final
Buttons: use non-deprecated MSPSim button api
Merge pull request #846 from ejoerns/pull-req/cooja-platform

Cooja platform fixes
New PluginType SIM_CONTROL_PLUGIN for sim control

SIM_CONTROL_PLGUIN are handled like SIM_PLUGIN, with one exception.
If the simulation is started with -nogui=<simfile> than it is checked
if a controlling plugin is loaded. If not, the simulation terminates
with an error message.
Better error message when aborting simulation
Button: Allow to press and release button by mouse and key

In the previous implementation a click event was triggered when the
button was pressed.
This implementation allows to set and release buttons independently both
by mouse clicking and by key typing.
Added the control plugin behaviour to executeJAR