[MacPorts] #15008: Update gnuplot to 4.2.3

[MacPorts]

#15008: Update gnuplot to 4.2.3
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 Reporter:  zenitani at mac.com  |       Owner:  macports-tickets at lists.macosforge.org
     Type:  defect            |      Status:  new                                  
 Priority:  Normal            |   Milestone:                                       
Component:  ports             |     Version:  1.6.0                                
 Keywords:                    |  
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 Please update gnuplot to 4.2.3. It would be nice if there is a variant
 with --enable-history-file option.

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Ticket URL: <http://trac.macosforge.org/projects/macports/ticket/15008>
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