[bug-enscript] enscript -DDuplex:true doesn't eject before starting next document

[Steve Kelem]

 Details:

I print double-sided. If I print multiple documents on the same command line,
each document doesn't start on a new piece of paper. Instead successive
documents start on the next blank side of paper. This means if doc-A is 1 page
long, and doc-B is 1 page long, the documents end up on opposite sides of the
same piece of paper. I need each document to be double-sided, but completely
separate.

Yes, I could invoke "enscript" once per document, but then I can't use
wild-cards in the file specification without the first page of some document
ending up on the backside of the previous document.

Please provide a switch to select between these two behaviors.