Head(er) splitting.

[s369625@student.uq.edu.au]

Ok I split PenguinPlay.h into bits.
Now we have
	PenguinPlay.h	-  Basic types, debugging error message routines, etc.
	LayerO.h	-  C++ base classes, my Pshyco GETSET macros.
	Exception.h	-  Moved the excaption base class from PenguinPlay.h to
			    here.  Did I do the right thing or did Chris not do
			    that earlier for some reasone?

I haven't taken all the pointless type definitions out of PenguinPlay.h.  I
shall do that now and watch pg2d break.


Till then.