a couple of items

[Mario Frasca]

consider this table, partially from the Wikipedia:

#+PLOT: with:histogram ind:1
| Region         |   Area | Production |Productivity |
|                |  (Mha) |  (Mtonnes) |  (tonnes/ha) |
|----------------+--------+------------+--------------|
| Western Europe |  2.490 |      5.730 |    2.3012048 |
| North America  |  2.960 |      5.756 |    1.9445946 |
| South America  |  0.102 |      0.196 |    1.9215686 |
| Middle East    |  4.462 |      6.950 |    1.5575975 |
| North Africa   |  3.290 |      3.214 |    0.9768997 |
| Others         |  3.756 |      3.540 |    0.9424920 |
|----------------+--------+------------+--------------|
| World          | 17.060 |     25.360 |    1.4865181 |
#+TBLFM: $4=$3/$2

here I have a couple things which I would like to do straight from 
org-plot, and don't work.

1) keep the header on two lines.

2) only plot the middle section, that's excluding the "world" summary.

3) manually indicate the desired colour for each bar.

4) plot one of the columns as points, not as bars.

something unrelated, but still about org-plot:

*) it's very practical that you can split #+PLOT lines, and it would be 
more useful if you could mark any of them as non active, "comment out", 
but so that this doesn't break the search for options.  something like 
#--+PLOT, whatever.  I would use it for alternative settings and it 
would spare me shuffling lines around.