xo-object: GC unit test

docs/glossary.rst

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+.. _glossary:
+
+Glossary
+--------
+
+.. glossary::
+    GC
+     | garbage collector
+
+    mlog
+     | mutation log.
+     | Remembers cross-generation and cross-checkpoint pointers
+
+    nursery
+     | in garbage collector, memory region dedicated to young objects.
+     | These are objects that have survived less than 2 incremental collection cycles.
+
+    tenured
+     | in garbage collector, memory region dedicated to older objects.
+     | These are defined as objects that have survived 2 or more incremental collection cycles.
+
+    xgen
+     | cross-generation tenured->nursery pointer; requires special GC bookkeeping
+
+    xckp
+     | cross-checkpoint pointer; requires special GC bookkeeping
+
+.. toctree::