[Orgmode] Minor visual improvement for tables

[Bastien]

Hi Carsten and list,

i use orgtbl-mode more and more -- great fun.  Maybe it's just a matter of
taste, but i find the following display more appropriate :

+--------------------+
| A very small table |
+--------------------+

... rather than :

|--------------------|
| A very small table |
|--------------------|

I guess replacing "|" with "+" at the beginning of the table lines is not
that straightforward... but anyway.

What people think on that ?

-- 
Bastien