[MacPorts] #14540: Document -devel ports

[MacPorts]

#14540: Document -devel ports
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 Reporter:  ryandesign@…             |       Owner:  markd@…           
     Type:  enhancement              |      Status:  new               
 Priority:  Normal                   |   Milestone:                    
Component:  guide                    |     Version:  1.6.0             
 Keywords:                           |        Port:                    
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Comment(by ryandesign@…):

 Continued:

  * -devel and non-devel ports should be marked as conflicting with one
 another, e.g. port foo-devel should contain the line "`conflicts foo`" and
 port foo should contain the line "`conflicts foo-devel`"
  * if it is ever decided that a port foo-devel will no longer be updated,
 and that only the stable port foo will remain, the port foo-devel should
 be marked as a stub port using "`replaced_by foo`" and all the other
 verbiage that goes along with replacing a port (pre-fetch block preventing
 new installations); foo-devel should remain in this stub state until all
 users can reasonably be expected to have noticed (e.g. one year) after
 which time foo-devel can be deleted from the ports tree

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Ticket URL: <https://trac.macports.org/ticket/14540#comment:5>
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