title: bad quality of picture in gnuplot 4.6.1
body: <p>I have just shifted from gnuplot 4.4 to 4.6.1. And unluckily found that all the pictures in x11 terminal have lost in quality pretty much (low resolution). It seems to me smth is wrong with configuration of gnuplot (I compiled 4.6 from sources and did not apply any options to configure).</p>
  
  <p>Has anybody encountered with such problem?</p>
  
  <p>Best regards,
    Alexander</p>
  
  <p>upd:
  here are the screenshots of 4.2 and 4.6 respectively:
  <a href="https://picasaweb.google.com/102562667690948164683/212012?authkey=Gv1sRgCPj9s7CH1Z3LgAE#5813182842354188578" rel="nofollow">https://picasaweb.google.com/102562667690948164683/212012?authkey=Gv1sRgCPj9s7CH1Z3LgAE#5813182842354188578</a></p>
  
  <p><a href="https://picasaweb.google.com/102562667690948164683/212012?authkey=Gv1sRgCPj9s7CH1Z3LgAE#5813182919536461282" rel="nofollow">https://picasaweb.google.com/102562667690948164683/212012?authkey=Gv1sRgCPj9s7CH1Z3LgAE#5813182919536461282</a></p>