John MacFarlane
4ec69b2679
This handles row and colspans. Partially addresses #6344. It also ensures that cells won't wrap text in places where it wouldn't normally wrap, even if this means making the cells wider than requested by the colspec. (Closes #9001. Closes 7641.) Parameters are different, so this is a breaking [API change]. Markdown, RST, and Muse writers have been adjusted to use the new `gridTable`.