BZ 1006734 - Exception in server.log caused that loading of designer freeze

Conflicts:
	jbpm-designer-backend/src/main/java/org/jbpm/designer/bpmn2/validation/BPMN2SyntaxChecker.java
	jbpm-designer-client/src/main/java/org/jbpm/designer/client/DesignerPresenter.java
BZ 953868 :  Loading designer for signal.bpmn never end - probably invalid definition
temp disabling concurrent functionality
BZ 996023 - Designer complains about missing BPMNDI information which is not missing
BZ 991374 - Unable to open BPMN2 definition which contains DataInput without name