[Bugs] #1278 UNSP: Remove the column headers from Journal gtk.treeview

[SugarLabs Bugs]

#1278: Remove the column headers from Journal gtk.treeview
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    Reporter:  garycmartin                |          Owner:  tomeu            
        Type:  defect                     |         Status:  new              
    Priority:  Unspecified by Maintainer  |      Milestone:  0.86             
   Component:  sugar                      |        Version:  Git as of bugdate
    Severity:  Unspecified                |       Keywords:                   
Distribution:  Unspecified                |   Status_field:  Unconfirmed      
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 Based on testing, and threads on dev ML and IRC meetings, the gtk.treeview
 column headers are much more confusing than helpful. They provide minimal
 sorting benefits and can cause much UI confusion/complication and consume
 UI space.

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Ticket URL: <http://dev.sugarlabs.org/ticket/1278>
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