Merge/split cell bugs

[Martin Kou]

The first bug is that vertical cell merging in Firefox does not work.

Reproduction procedure:

1. Create a new table.
2. Select two adjacent cells in a column.
3. Right click -> Cells -> Merge cells.
4. The cells aren't merged.

The second bug is that the horizontal split cell command produces "inefficient" tables. Reproduction procedure:

1. Create a 3x3 table.
2. Select a row with 3 cells, and merge them. (or "Merge Right" twice in IE)
3. Now split the merged cell.
4. Go to source mode.
5. Notice that for all rows, the first cell of the row has a colspan=2, which is excessive.

[Martin Kou]

Merge down geometry bug

1. Create a 3x3 table.
2. Merge the first two cells in the first row by "Merge Right".
3. Right click on the merged cell, choose "Merge Down".
4. Now you have a weired table, step 3 shouldn't be allowed in the first place.

[Martin Kou]

Fixed with [691], [692], [693] and [695].

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