qt-settings file

[John W. Eaton]

With the upcoming release, I think we will want to replace any existing 
~/.config/octave/qt-settings files that happen to be installed and 
replace them with our current default version.  Previous versions of 
these files could be from very old pre-release versions of the GUI that 
simply don't work properly.  The only question for me is whether we 
should do this unconditionally or give people the option of keeping 
their existing file, along with some strong encouragement that if there 
is any doubt they should allow the file to be replaced.  I'm also not 
sure whether we need to bother backing up the existing file.  I guess I 
would vote no, as I don't think it is really all that important, but 
maybe someone will convince me otherwise.

Comments?

jwe