Link client/appstream-util against gdk-pixbuf.
trivial: Correctly subsume extends data
trivial: Correctly subsume the id kind
Allow different source roots to define addons
Never add duplicate <extends> tags
Allow desktop->addon demotion with an AppData file

We might want to do this for Adobe Flash, which isn't really an application.
trivial: Warn when discarding addons because of API version

This would have saved a lot of head-scratching this morning...
Add some validation rules for metainfo files
Add as_store_set_builder_id()

This is used to identify builder versions with compatible metadata.
Remove support for pre-decompressed RPMs

This reverts commit 3a5af07a042d248d2a7cb783a1c9af14f056c4e5.
With the metadata cache work we don't need this complexity anymore.
Add as_store_remove_all()

This clears out all applications from the store.
trivial: Be less verbose when downloading Fedora packages
trivial: Demote 'Adding extra package' to a debug