Big API change ahead

[Tuomas Lukka <lukka@xxxxxxxxxx>]

Having tested the new one-letter cell traversal functions in a couple of
files, I find that they are SO much better to use and clutter the code
less that we should move to them completely. 

So I'm now officially deprecating the following functions:

	getNeighbour
	getHeadcell
	getSteps
	newCell
	getText

in favor of

	s
	h
	N
	t

in ZZCell.java.

Any objections? These functions are SO commonly used that there is just no 
sense in keeping them with such long names.

Also, I don't think we shall be using many other one-letter method names,
as other methods are not as common.

The rest of the source should adapt to this deprecation shortly.

	Tuomas