Add syzomatic.

This is a shell script that uses some simple heuristics to guess the
contents of the syzfile.  Usually at least a good starting point to work
from.

Based on initial work by Dale Roberts <ds.roberts@anu.edu.au> (who also
provided the excellent name), although I'm afraid not much of the
original remains.
Add syzln.

This is a shell script to generate and maintain the tree of symlinks
that live under the .sf directory, and point back to the actual
syzfiles.

Based on initial work by Dale Roberts <ds.roberts@anu.edu.au> (who also
provided the inspiration for the name), although I'm afraid not much of
the original remains.
Add support for the /sw/nix based trees.

/sw/nix is for software that has been "appropriated" from Nix
(http://nixos.org/nix/) and suitably massaged.  Documentation for the
massaging process will be added shortly.