[MacPorts] #28614: mercurial: update to 1.8

[MacPorts]

#28614: mercurial: update to 1.8
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 Reporter:  studio17@…          |       Owner:  macports-tickets@…                   
     Type:  update              |      Status:  new                                  
 Priority:  Normal              |   Milestone:                                       
Component:  ports               |     Version:  1.9.2                                
 Keywords:                      |        Port:  mercurial                            
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 Mercurial 1.8 has just been released. Updating to 1.8 from the current
 1.7.3 will pick up all the bug fixes from 1.7.4 and 1.7.5 as while as
 several feature and robustness improvements.

 http://mercurial.selenic.com/

 http://mercurial.selenic.com/wiki/WhatsNew#A1.8_.282011-03-01.29

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Ticket URL: <https://trac.macports.org/ticket/28614>
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