AmptekHardwareInterface.py

- Created classes for storing the status and spectrum data
- Removed the status query functions in AmptekHardwareInterface
- updateStatus will return a reference to the status. Python code should
use this instead of the removed query functions. E.g. instead of
interface.FastCount(), interface.updateSpectrum(max_age).FastCount()
will result in the same behaviour
- Cleanup of the list mode/ sequential mode functions, which were
prototyped during hardware tests
- Added Doxygen comments to AmptekHardwareInterface and AmptekStatus
member functions