update.php now create profiling table when needed

update.php now create profiling table when needed

When enabling $wgProfileToDatabase, one would have to manually apply a
patch to the database that would add the `profiling` table. This patch
let update.php creates the table whenever $wgProfileToDatabase is true.

This also provide a SQL patch for SQLite backend and update
profileinfo.php to give some clue about enabling the global and running
update.php

Change-Id: If68a25f7ec2b0fbb61f82a318427abe58a89dae7