[MacPorts] #29988: bzr*: add pythonXX variants

[MacPorts]

#29988: bzr*: add pythonXX variants
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 Reporter:  macsforever2000@…             |       Owner:  raimue@…                                                                                                       
     Type:  enhancement                   |      Status:  new                                                                                                            
 Priority:  Normal                        |   Milestone:                                                                                                                 
Component:  ports                         |     Version:                                                                                                                 
 Keywords:                                |        Port:  bzr bzr-explorer bzr-fastimport bzr-git bzr-gtk bzr-pager bzr-rebase bzr-rewrite bzr-svn bzr-xmloutput bzrtools
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 Can bzr and its child ports be modified to have the standard python26,
 python27, etc. variants? I see that they were switched to python27
 recently, but having a choice would be much preferable.

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Ticket URL: <https://trac.macports.org/ticket/29988>
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