~dylanmccall/update-manager/bug-1195573

666 by Michael Vogt
* DistUpgrade/DistUpgradeViewGtk.py,
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* offer removal of no-longer-supported apps
668 by Michael Vogt
* UpdateManager/DistUpgradeFetcherCore.py:
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* improve countrymirror detection
666 by Michael Vogt
* DistUpgrade/DistUpgradeViewGtk.py,
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4
358.1.46 by Michael Vogt
* UpdateManager/Common/aptsources.py:
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UpdateManager.Common.aptsources.py:
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- make the distro detection in sources.list more clever by using the
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  origin informaton to avoid adding full uris to (unofficial/internal)
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  mirrors 
358.1.47 by Michael Vogt
* added new "MirrorsFile" keyword for the DistInfo Tagfile
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- make it possible to inherit the mirrros from a ParentSuite (for
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  the childs)
358.1.46 by Michael Vogt
* UpdateManager/Common/aptsources.py:
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Misc:
8 by Michael Vogt
* added TODO item
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- add download size to treeview
1 by Michael Vogt
* initial revision (after accidently killing it)
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- add /etc/apt/software-properties.d dir where the user can
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  install matchers and templates
123.1.58 by Sebastian Heinlein
* Rendering of channel sources:
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- handle cases like "deb http://bla/ dist sec1 sec2 # comment" 
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- rework the add channel/cdrom dialogs
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- d'n'd for key files
123.1.59 by Sebastian Heinlein
* more TODO
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- use one row per section and not one per channel in the treeview
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- sort the sources by dist