Fixes #10842

All issues for types that use "extra lines" for extended information.  Two issues fixed: (1) When namespaces are listed an extra column isn't inserted for extra lines and (2) trailing tabs aren't inserted when label columns are specified.

This code should probably move to a more explicit model of putting data into "cells".

The test for this hits https://github.com/golang/go/issues/6416 and so I introduced a "LineDelimiter" writer filter to make white space more visible.