#8 Add GULP output format

[Keith Refson]

Another output format which I and my students and collaborators would make use of would be GULP.
This is not a vitally urgent request, but one which would be welcome if it were done.

[Torbjörn Björkman]

You can have it tomorrow, depending on how clever you need it to be. I checked the GULP manual, and there are a bazillion knobs and switches, but dumb-as-a-post output that just prints cell vectors and positions to a file is a 10-15 minute job. What more precisely do you need it to do?