Add ultimo, instant, and proximo post.

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+Looking into old birth, death, and marriage records, I ran across
+dates such oas "on the 12th instant".  Looking this up it [turns
+out][ref] to be shorthand for "the current month".  Related terms:
+
+* Ultimo (the previous month, from Latin *ultimo mense*, abbreviated *ult*)
+* Instant (the current month, from Latin *instante mense*, abbreviated *inst*)
+* Proximo (the next month, from Latin *proximo mense*, abbreviated *prox*)
+
+[ref]: http://www.worldwidewords.org/weirdwords/ww-ult2.htm
+
+[[!tag tags/fun]]