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* The way locale extensions work has changed. Now we build a single extension
for all locales, but we allow you to specify a subset of it during installation
and update time using the --subpath commandline flag.
The main reason for this is that the many extensions didn't scale, both in
technical terms (large ostree summary file size), but also in terms of the
UI listing hundreds of uninteresting things.
* We no longer use sizes in the commit objects to get installed and download size,
instead we store some extra metadata in the summary file. This allows us
to get much faster access to these, as with recent ostree versions we can
cache the summary file.
* New command xdg-app build-sign that lets you sign a commit at any time.
* New argument xdg-app build --force-clean that removes pre-existing build dirs.
* xdg-app run now uses the "current" version as the default if you specify no
branch or arch. It used to default to the "master" branch. This will default
to the last installed version, but can be changed with xdg-app make-current.
* Added config-opts to the build-options in xdg-app-builder. This allows you
to extend the configure flags in an arch dependent way.
* Documentation updates