Revised GNATS manual committed

[Yngve Svendsen]

I have just committed a preliminary new version of the GNATS manual, 
revised and to a large degree rewritten for GNATS 4. Specifics for this 
version are as follows:

- Chapter 3, "GNATS Administration" is finished
- Appendix A, "Installing GNATS" is usable for installation of version 4, 
but the way user tools installation is documented is not satisfactory. I 
will probably separate this out into an entirely new appendix.
- The rest of the appendixes are believed to be finished.
- Chapters 1 and 2 have not been revised yet.


Yngve Svendsen