[MacPorts] #17477: Integrate *_select tools into port

[MacPorts]

#17477: Integrate *_select tools into port
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 Reporter:  blb@…             |       Owner:  macports-tickets@…                   
     Type:  enhancement       |      Status:  new                                  
 Priority:  Normal            |   Milestone:  MacPorts 1.8.0                       
Component:  base              |     Version:  1.7.0                                
 Keywords:  select            |        Port:                                       
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Comment(by perry@…):

 Since my last update, I've integrated Rainer's latest changes to *_select
 (specifically --show now uses the 'current' symlink to determine the
 selected version) and added more specific error messages to port select
 (r44676).

 After more testing, I'll likely merge the code into trunk/base since all
 of the essential functionality seems to be there now.

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Ticket URL: <http://trac.macports.org/ticket/17477#comment:11>
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