Fixing bug in GroupManager. "inInGroup" supposed to be called "isInGroup". Also, removed Bag.contains checks if the instances are the same. Now checking if instances are the same or if the values are the same (equals).
Fixing bug in GroupManager. "inInGroup" supposed to be called "isInGroup".
Also, removed Bag.contains checks if the instances are the same. Now checking
if instances are the same or if the values are the same (equals).

antag99/artemis-odb,snorrees/artemis-odb,snorrees/artemis-odb,DaanVanYperen/artemis-odb,gjroelofs/artemis-odb,antag99/artemis-odb,Namek/artemis-odb,gjroelofs/artemis-odb,gjroelofs/artemis-odb