Back to FreeRTOS definition of push and save context macros
Initialize the SP with the upper part to 0, cause gcc problem to get 3byte PC
Proposing to clean the file DuinOS.h 'cause the lowtext attribute is in macro definition from FreeRTOS on file portmacro.h and here is duplicated
Merge branch 'proposalToDuinOS_h' into masterMy