Previously we used our own homespun formatting. But this
produces over-long lines that aren't ideal for diffs in tests.
Easier to use something off-the-shelf and standard.
Closes#7580.
Performance is slower by about a factor of 10, but this isn't
really a problem because native isn't suitable as a serialization
format. (For serialization you should use json, because the reader
is so much faster than native.)
If the table lacks a header, the header row should be an empty
list. Previously we got a list of empty cells, which caused
an empty header to be emitted instead of no header. In LaTeX/PDF
output that meant we got a double top line with space between.
@tarleb @despres - please let me know if this is problematic
for some reason I'm not grasping.
- Writers.Native is now adapted to the new Table type.
- Inline captions should now be conditionally wrapped in a Plain, not
a Para block.
- The toLegacyTable function now lives in Writers.Shared.
