Add more dimensions to the benchmark

[allan-simon]

1. table with index /without index => important to know
2. table with one, two , three columns etc.
3. one text raw but with small text versus bigtext
4. number of messages per request (I think the performance difference between the 3 methods with 1 message is not the same than with over 9000 messages) => import to known
5. version of postgresql

etc.

[allan-simon]

and cerise on the gateau, if you can generate a "graph" version of all these dimensions would be awesome, and will make this repository a reference on the subject :)