/** changes **/ made all component classes in Components public so as to be available to the unit tests
commented empty object attribute declarations in Querymanager
(geheugenNode.Geheugenslots;) for causing build errors while testing.
/** Unit test cases **/
matcherPriceComparisonTest - Check sorting mechanism for lists of components.
...AttributeAssignmentTest - check the object type, check if assigned variables are
stored correctly.
QueryManager and MatcherMainProgram cannot be tested without changing a fair amount of
acces modifyers