Previously we used an odd mix of 3- and 4-space indentation.
Now we use 3-space indentation, except for ordered lists,
where indentation must depend on the width of the list marker.
Closes#4563.
* Annotate gridTable code with comments and abstract small functions
* Don't wrap lines in tables when `--wrap=none`. Instead, expand cells, even if
it results in cells that don't respect relative widths or surpass page column width.
* This change affects RST, Markdown, and Haddock writers.