HTML reader: improved table parsing.

We now check explicitly for non-1 rowspan or colspan
attributes, and fail when we encounter them. Previously
we checked that each row had the same number of cells,
but that could be true even with rowspans/colspans.
And there are cases where it isn't true in tables that
we can handle fine -- e.g. when a tr element is empty.
So now we just pad rows with empty cells when needed.

Closes #3027.

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