Print Dialog

[John W. Eaton]

I checked in the following changeset to enable the "Save" and "Save As" 
options in the "File" menu for the Qt Figure widget:

  http://hg.savannah.gnu.org/hgweb/octave/rev/7335cc071ab0

I'd also like to provide a "Print" option so that we can send figure 
output directly to a printer.  Does anyone with Qt experience know how 
best to do this?  We can already generate PostScript or PDF output, but 
what is the proper way to use the QPrintDialog and QPrinter classes to 
send PostScript to a printer?

jwe