From: Alexandre Detiste <tchet@debian.org>
Subject: appdata in legacy format and location

--- a/setup.py
+++ b/setup.py
@@ -100,7 +100,7 @@
     scripts=["bin/photocollage"],
     data_files=[
         ("share/applications", ["data/photocollage.desktop"]),
-        ("share/appdata", ["data/photocollage.appdata.xml"]),
+        ("share/metainfo", ["data/photocollage.appdata.xml"]),
         ("share/icons/hicolor/scalable/apps",
          ["data/icons/hicolor/scalable/apps/photocollage.svg"]),
         ("share/icons/hicolor/16x16/apps",
