default font for GUI on Windows systems

[John W. Eaton]

Your recent change 
http://hg.savannah.gnu.org/hgweb/octave/rev/4bb1b82076e5 sets the 
default font in various places to be "Courier New".  Does that work for 
you with the Windows terminal?  It does not work for me, I'm seeing the 
cursor offset from the prompt if I use that.  OTOH, "Lucida Console" 
does work for me.

Also, it seems we have the literal string "Courier New" in many places. 
 Maybe we should use a function or macro instead so that it only needs 
to be set in one location?

jwe