The interface for adding implementations to the system store has changed. Instead of
calling 0store-helper, we call 0store-secure-add-helper. This takes the digest as its
only argument, and requires the .manifest file to already exist.
You can no longer add 'sha1' implementations to the system cache. This algorithm has
been deprecated for a long time and should not be used.
A new 0store-secure-add command is installed by default. This is the command that is
called by sudo. It replaces 0store-helper-priv. See its man-page for details.
Added Stores.get_first_system_store() as a cleaner way to discover the system store.
git-svn-id: file:///home/talex/Backups/sf.net/Subversion/zero-install/trunk/0launch@1930 9f8c893c-44ee-0310-b757-c8ca8341c71e