Since the change which comes with commit 14f3660 'add always default
folding reconciler' is faulty, it should be removed.
Reason:
hasExternalFoldingAnnotations is always false because
containsExternalFoldingAnnotations() can  never return true,
because FoldingAnnotation is a non public class which cannot be used by
external folding reconciler strategies, like the one provided by LSP4E.

Therefore the external folding strategy provided via extension point is
not considered.