[O] rst-mode tables

[Andrea Crotti]

I'm writing in RST a lot of documentation, and I noticed that RST-tables 
are very similar to org-mode tables.

This makes me think that I could use happily turn-on-orgtbl and use it, 
but the tables are not exactly the same.

+--------+-------+---+---+
| THi is | table |   |   |
+--------+-------+---+---+
|        |       |   |   |
+--------+-------+---+---+

One difference is in the use of "+", is there a way to make orgtbl 
produce something like this too?
//