[development] Testing SQLite on Linux

This may be obvious, but if you place the database file on a tmpfs, it runs much faster. You can do this by specifying e.g. /dev/shm/drupal as the database name when you install. Pointless for a real site, of course, but useful for a once-off local install to run the simpletests. On my laptop (which admittedly runs dm-crypt, perhaps putting the HD at an unfair disadvantage) the difference is on the scale of under 17 minutes versus over two hours for running the full test suite. Just a heads up in case anyone else didn't realize this. -john