[O] Multicolumn

[Neuwirth Erich]

After some googling it seems that multicolumn support is not yet implemented in 
org tables.
I would need multicolumn headers quite urgently,
but I have not yet found a way to make this possible.

I think that tables with headers like this:

|               |    mean       |         s.e.        |
| gender | varA | varB |  varA | varB |

are quite common, so I really want to put this feature on the wish list.
I am not able to implement this myself.

Erich