Remove support for external panels

[Tim Lunn]

We have been carrying patches that reimplented support for external panels in gnome-control-center, however this is only used by deja-dup these days. Rather than continuing to maintain these patches, we are dropping this support and will just use the desktop launcher to load the standalone deja-dup-preferences.

This also drops the libgnome-control-center shared library, so deja-dup will need to disable build of the g-c-c panel.

ProblemType: BugDistroRelease: Ubuntu 15.10
Package: gnome-control-center 1:3.16.2-2ubuntu1~wily3 [origin: LP-PPA-gnome3-team-gnome3-staging]
ProcVersionSignature: Ubuntu 3.19.0-18.18-generic 3.19.6
Uname: Linux 3.19.0-18-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.18-0ubuntu2
Architecture: amd64
CurrentDesktop: GNOME
Date: Fri Jul 24 10:01:56 2015
InstallationDate: Installed on 2012-09-23 (1033 days ago)
InstallationMedia: Ubuntu GNOME Remix 12.10 "Quantal Quetzal" - Alpha amd64(20120922)SourcePackage: gnome-control-center
UpgradeStatus: No upgrade log present (probably fresh install)
usr_lib_gnome-control-center: deja-dup 34.0-1ubuntu1

[Tim Lunn (darkxst)]

These are the required changes for deja-dup.

The g-c-c changes will be uploaded with 3.16 as bug 1466245

[Sebastien Bacher (seb128)]

https://launchpad.net/ubuntu/+source/deja-dup/34.0-1ubuntu2