[OSGeo] #1689: Add libravatar support to Trac

[OSGeo]

#1689: Add libravatar support to Trac
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 Reporter:  strk          |       Owner:  strk
     Type:  task          |      Status:  new
 Priority:  normal        |   Milestone:
Component:  Trac          |  Resolution:
 Keywords:  trac, avatar  |
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Comment (by strk):

 See also #2105 (test for cross-reference plugin, mostly)
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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/1689#comment:2>
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