[MacPorts] #36848: Update Grace to new upstream version 5.1.23

[MacPorts]

#36848: Update Grace to new upstream version 5.1.23
------------------------+--------------------------------
 Reporter:  feranick@…  |      Owner:  macports-tickets@…
     Type:  update      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.1.2
 Keywords:              |       Port:  Grace
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 Grace (and XmGrace) have just been upgraded to version 5.1.23. The upgrade
 is strongly recommended.

 Changelog:

     removed *86 specific optimizations (rep. #2154)
     renamed RMS per cent error -> relative error (rep. #2192)
     a workaround for a bug in recent Xorg not releasing grab of popup
 menus
     accept -graphtype chart instead of bar. List possible values in the
 help output
     fix building against png-1.5
     a grace_np fix
     IsoLatin5.enc was not included in the distribution

 http://plasma-gate.weizmann.ac.il/Grace/phpbb/viewtopic.php?f=2&t=2442

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Ticket URL: <https://trac.macports.org/ticket/36848>
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