[MacPorts] #20053: Document the port naming convention of replacing ++ with xx

[MacPorts]

#20053: Document the port naming convention of replacing ++ with xx
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 Reporter:  blb@…             |       Owner:  markd@…           
     Type:  defect            |      Status:  new               
 Priority:  Normal            |   Milestone:                    
Component:  guide             |     Version:  1.8.0             
 Keywords:                    |        Port:                    
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 Several ports whose "true" name have ++ in their names (libsigc++,
 libxml++, mysql++, and others) have the plus signs replaced with the
 letter x (libsigcxx2, libxmlxx, mysqlxx).  This is the convention we've
 picked (and is also used in other project names directly like libpqxx),
 but we have no current documentation for it in the guide.  This should be
 added someplace.

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Ticket URL: <http://trac.macports.org/ticket/20053>
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