Standardizing the cancelling and aborting behaviour of the
OBDAProgressListeners
Added method "isErrorShown" to OBDAProgressListeners and classes
implementing it. Used to prevent unnecessary error messages.
Refactoring the implementations of OBDAProgressListeners to remove
duplicate code in QueryInterfaceView
Refactored OBDADataQueryAction to avoid repeated code in
QueryInterfaceView
Merge branch 'develop' into bugfix/AbortedProtegeQuery
Merge branch 'bugfix/AbortedProtegeQuery' into develop
Merge branch 'develop' into version2

Conflicts:
	obdalib-protege41/src/main/java/org/semanticweb/ontop/protege4/panels/QueryInterfacePanel.java
	obdalib-protege41/src/main/java/org/semanticweb/ontop/protege4/views/QueryInterfaceView.java
Merge branch 'version2' into feature/aggregates2