[Nauty] Version 2.2 beta 6 released

[Brendan McKay]

The nauty web page at  http://cs.anu.edu.au/~bdm/nauty/
now contains beta 6 of version 2.2 of nauty.

The main changes are:

* genbg (generator for bicoloured graphs) got a few more
  parameters and speed-ups.  The new parameters are:
   -d#:#   - specify minimum degree on each side
   -Z#     - specify maximum number of common neighbours of
               two vertices in the second class
   -z      - specify that two vertices in the second class
	       cannot have the same neighbourhood
  Use  genbg -help  to see a summary of all parameters.

* The web page now has a ZIP file as well as a tar.gz file.  The
  ZIP file has DOS line endings.

* The makefile now forces you to run configure.  If you say 
  "make" immediately after unpacking the archive, you see this:

========================================================================
| In order to compile nauty on systems which include a Unix-like shell
| (which includes MacOSX and Cygwin), you must first run the script
| "configure".  Usually this can be done with the command
|  ./configure
| 
| The configure script will create custom versions of these files:
|   gtools.h makefile naututil.h nauty.h
| Afterwards you can use "make" to compile everything.
| 
| In case you can't run shell scripts, or configure doesn't work for 
| some reason, you need to adjust the configuration by hand:
| For gtools.h, naututil.h, and nauty.h, make sure definitions near the
| start of the file (like HAVE_UNISTD_H and SIZEOF_INT) are all correct.
| For makefile, copy the file makefile.basic to makefile, then check the
| definitions near the start.
| 
| Please notify Brendan McKay <bdm at cs.anu.edu.au> of any problems with
| the configuration and of any hints you might have for other people with
| similar setups as you have.
========================================================================

As always, please report all problems even tiny ones.

Brendan.