SWI-Prolog MacOS app

Hi,

A real Prolog MacOS app is getting close to testing phase.  One of
the remaining issues is integration with the finder.  Below are
some thoughts about that.  Comments from Mac users is welcome.

   - Currently, I register Prolog for .pl and .prolog files (still need
     to figure out how to get an icon there).   More?

   - Double clicking always sends a message to the already running app,
     while I think you want to load the file into a new instance.  So,
     if a running app gets a file-open-event, it now runs

	open -n -a <myself> <file>

     Does that make sense?

   - What if you just start Prolog from the Applications folder, it
     now starts in this directory.  That is most likely not what you
     want.  In Windows it creates a Prolog directory under the
     `personal' folder and starts there.  Is there a similar convention
     for the Mac?

	Cheers --- Jan