Lars reviewing DatabaseInterface.php

Obviously the excellent commenting in this interface file makes it a lot 
easier to understand than it might otherwiser be.  I think in general it 
looks good.  I think the functions are named well and the types are 
described in the comments which is good because it is more difficult to 
figure out what types parameters should be in php.

The function that jumps out at me though is createDatabase().  This, for 
me, was the only method whose meaning was not totally clear after 
reading its name or comments.  I think I am in part confused by the 
complicated nature of its parameters.  I am not entirely familiar with 
databases, so maybe there is not another (or there is not a better) way 
to initialize one, but I would at least like to learn a little bit more 
about what is going on here.

Schedule looks great.  I think having this done nice and early will be a 
big plus.