Add a test with all the affiliated keyword types.

org_mode_samples/greater_element/plain_list/affiliated_keyword.org

@@ -0,0 +1,15 @@
+#+NAME: a
+#+caption: b
+#+results: c
+#+headers: d
+#+header: e
+#+label: f
+#+plot: g
+#+resname: h
+#+result: i
+#+source: j
+#+srcname: k
+#+tblname: l
+#+attr_latex: m
+#+attr_html: n
+1. bar