Removed unused imports

...datamining/pattern_mining/MakePatternOccurrencesSpan.java

.../be/uantwerpen/datamining/pattern_mining/MakeWindows.java

...ain/java/be/uantwerpen/datamining/service/Operations.java

src/main/java/be/uantwerpen/ldataminining/model/Table.java

.../be/uantwerpen/ldataminining/preprocessing/ArffUtils.java

src/main/java/be/uantwerpen/ldataminining/utils/IOUtils.java

src/main/java/be/uantwerpen/ldataminining/utils/Utils.java

src/main/java/be/uantwerpen/mime_webapp/WebAppConfig.java

...antwerpen/mime_webapp/controller/TableLoadController.java

...antwerpen/mime_webapp/controller/TransformController.java

...java/be/uantwerpen/mime_webapp/dao/ProjectRepository.java

...test/java/be/uantwerpen/datamining/AutoCSVToArffTest.java