Created script for dumping the movies and showings of a festival edition in an XML file (for testing purposes).

 * fixed overlapping movies in database.
Added a conflict map, a work-in-progress scheduling implementation and test data for a real-life festival.
Added wrapper for ScheduleConstraints (which is now ScheduleConstraintsDefinition).
Added code to write constraints to an XML (for use in unit testing).
Created a conflict graph that will be used by the scheduling algorithm.