emysql:execute_many/2,3

Ability to execute a few queries, in order, in the same connection.
Useful for queries that leave some state behind:

* SELECT ROW_COUNT()  (MySQL)
* LAST_INSERT_ID()  (MySQL)
* SHOW META  (Sphinx)
* etc

Jesper, if you are curious why this is here, this is my holiday homework. ;-)