~ember/update-manager/ubuntu.bug1002956

99 by Michael Vogt
* UpdateManager/UpdateManager.py,
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* offer removal of no-longer-supported apps
100 by Michael Vogt
* UpdateManager/DistUpgradeFetcherCore.py:
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* improve countrymirror detection
99 by Michael Vogt
* UpdateManager/UpdateManager.py,
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39 by Michael Vogt
* 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 
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- make it possible to inherit the mirrros from a ParentSuite (for
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  the childs)
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Misc:
7 by Michael Vogt
* UpdateManagert:
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- have a common error dialog readymade and rib out all those 
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  GtkMessageDialogs
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- add download size to treeview
1 by Michael Vogt
* translation updates
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- add /etc/apt/software-properties.d dir where the user can
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  install matchers and templates
12 by Michael Vogt
* po/pt_BR.po: updated translation
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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
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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