Added TosThreads support for Mulle.

From now on the M16c62p code only uses the interrupt stack. The tosthread library would else not work as intended.
Added a fix folder in the Mulle platforms folder. Se README in that folder for more information.
Did a minor fix to the at45db platform specific code regarding the initialization of the chip. The at45db chip is now initialized through the RealMainP software init so that it will be initialized after the mcu.