Changes
- Add comment that overflow of a counter in AO_stack_pop is impossible
- Add missed copyright header to ibmc/powerpc.h
- Adjust/reformat copyright header in armcc/arm_v6.h
- Build tests by default in CMake script
- Change AO_REAL_NEXT_PTR() to accept argument as reference only
- Change static initializer of initial_heap_ptr and spin_dummy to zero
- Consistently use '__sparc' pre...