Removing the table "scheduled" created by the XMLDB by default (it's a
bug in XMLDB, I'm just too lazy now to fix it). Adding new fields to
hold the result of the most recent execution.
The idea is to build a plugin that will internally call the random
allocator when the submissions deadline is reached. The teacher is able
to pre-define the configuration for the random allocator.
Eloy Lafuente (stronk7)