whatchanged:
- new concept of powerop power parameter is introduced
- new powerop core interface routine to set individual(or subset of)
  power parameter value is added
- no more string parsing at any layer
- no more va_list interface 
- powerop driver module refcounting is added
- documentation file including optional sysfs interface description is added

todo/issues:
- better implementation for getting registered operating point names
- configfs for operating points creation from user space