Qt term enhancements

[m s. <mw...@us...>]

Hi All,

I modified the qt term so you can  set three options that are currently 
on the tools dialog.

The change will allow you to specify rounded|butt, {no}replotonresize 
and {no}antialias.  These are temporary settings.

This also fixed a bug with the {no}ctrl option.  If multiple "set term 
qt" command were given before the plot window was opend, the {no}ctrl 
setting would be lost.

The attached diff is based on v5.4.1.  Let me know if something needs 
changed.

Once again, many thank to all of you that make Gnuplot so awesome.

Regards,

MikeS