Let MySQL ignore duplicate database errors on install
Killed off CI unit tests
These were too flakey to actually help out, as they were not able to run inside our slightly different CodeIgniter folder structure. It couldn't handle not being "system" and "application" for example. We've never relied on these so we will simply have to continue running without coverage. This is not too scary, as we're deleting huge chunks of CodeIgniter and increasing test coverage on the rest of the app.
Merge branch '2.3/develop' into 3.0/develop