[MacPorts] #14617: Update port polipo to better use ${prefix} and add a startup item

[MacPorts]

#14617: Update port polipo to better use ${prefix} and add a startup item
------------------------------+---------------------------------------------
 Reporter:  blb at macports.org  |       Owner:  boeyms at macports.org
     Type:  enhancement       |      Status:  new                
 Priority:  Normal            |   Milestone:  Port Enhancements  
Component:  ports             |     Version:  1.6.0              
 Keywords:                    |  
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 This update to the www/polipo port does several things: updates the code
 to expect config files in ${prefix}/etc/polipo instead of /etc/polipo
 (home directory support remains as is); copies the forbidden sample config
 file as well as the base config file; adds a startup item for it.

 The update will be attached in two files, one for the Portfile diff and
 the other a tarball of files/

 Long-term, this port should also create a user for it instead of running
 as root.

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Ticket URL: <http://trac.macosforge.org/projects/macports/ticket/14617>
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