export from ivtools to ghostview

ghostview (gs) is a PostScript previewer for X11 written on top of ghostscript by Tim Theisen at the University of Wisconsin. Linux binaries available from sunsite.unc.edu and most Linux/X11 distributions.

To use ghostview from an ivtools drawing editor, click on the "pipe to filter" check-box, which automatically changes the string editor to read ghostview (leave the format as idraw format)

up to ivtools add-ons