flatpak: update build-manifest to retrieve dependencies without initial download phase: - dependencies are now entirely retrieved from the installation, and requirement are build from there. The source package is currently always used, and it is now possible to use PYTHON_DEP_PREINSTALL to add extra packages or use a specific version of a package. - fixed insertion of `release_elt` for dev version at the right location. - `branch` is not set anymore for stable versions. - libxslt is not added anymore as it is part of freedesktop runtime - flathub share-modules is now used for Python 2

return {
	[false] = {
		["version"] = 17;
	};
	["pending"] = {};
	["dave@souliane.org"] = {
		["subscription"] = "both";
		["groups"] = {};
	};
	["frankie@souliane.org"] = {
		["subscription"] = "both";
		["groups"] = {};
	};
	["georges@souliane.org"] = {
		["subscription"] = "both";
		["groups"] = {};
	};
	["peter@souliane.org"] = {
		["subscription"] = "both";
		["groups"] = {};
	};
	["steven@souliane.org"] = {
		["subscription"] = "both";
		["groups"] = {};
	};
};