This involves some reordering and renaming of fields from the previous
output, but hopefully more readable (less vertical whitespace). This
commit depends on the changes to stdnse.output_table to ignore assigning
new keys to nil and to use the __call metamethod to mean has_contents()
This is the default and can be omitted. Seeing as the value of this
argument was "hardmatched" in 100% of cases, we're better off pretending
the parameter doesn't exist.
