Multiple thead rows, colspan/rowspan, and column reordering

Charley

There's some really weird behavior with colspan/rowspan and column reordering; I don't see anything noting that this wouldn't be supported.

http://jsfiddle.net/charleycartee/vb4cg6gz/7/

1. in the first table (colspan + rowspan), trying to swap columns 2 and 3 seems to almost universially fail.
2. in the first table (colspan + rowspan), dragging column 2 in front of 1 moves header 3 to position 1, but the data column is colum2, header for column 2 stays in column 2 but the data becomes column 1 data, header for column 1 moves to position 3 with data from column 3
3. in the second table (just colspan), dragging column 2 to 1 (and vice versa) seems to work except that it flips the first header row
4. in the second table (just colspan), dragging 3 to 4 (and vice versa)doesn't seem to do anything
5. in the second table (just colspan), dragging column 2 to 3 seems to work, but tat breaks the row