Added archiving and fixed list economy tracing bug.

Pages/Guide.php

@@ -205,6 +205,14 @@ $PageSection = "Guide";
                     <a href="/Pages/Mutations.html">Mutation encyclopedia</a>.
                 </p>
 
+                <p>
+                    Retired content may be archived instead of deleted.
+                    Archived plants and mutations no longer take part in
+                    normal progression, but anything you already discovered
+                    stays part of your Garden history and remains identified
+                    as archived in the encyclopedias.
+                </p>
+
                 <p>
                     Experiment with different plants, empty spaces, and
                     arrangements. Not every recipe has to look like the