Sc92/semantic checker

This code includes the checker for when words can be considered to be semantically equivalent. The code parts that do this are completely separated from the other code since integration still has to be done. Due to this property it should be easy to merge. The Files of interest are: The OpenDutchWordnet folder in the mvc folder. Should be put in the umbra folder in order for the code to work. The semantic_checker.py file in the mvc folder. Should also be in the umbra folder. The DWordnet_test.py file in the mvc folder. Should also be in the umbra folder. Though this file may be deleted later, it is still useful as a reference at this point. Mainly since integration has not yet been done.