formatted correctly from the 'head' table. Not having leading or
trailing zeroes in the fractional part means that they can't be
suppressed by anything that might try to canonicalise version numbers.
+
+Inspiration from a cycle ride: sticking the year in the version number
+would make it easier to see how old a release is. 3.YYn for the nth
+release in 20YY seems good. So the first one would be 3.246 (or maybe
+3.251).