BUG: Emit StartEvent before a ProgressEvent

It is unexpected behavior to emit a progress event before the start
event has been emitted. It may case problems with watcher which have
this assumption.

Change-Id: I02aaf8309b839a354328f9a0eef2a094ac5bf82b
BUG: Missing Modified() call

While reviewing differences between the bounded and unbounded
itkLBFGSOptimizer.cxx
itkLBFGSBOptimizer.cxx

The missing call to "Modified()" was identified.

Change-Id: I0bd0526a047fab3f8cb79d4a5b35c81385bd3b0f
Merge topic 'FixStreamingFilterProgressBeforeStartEvent'

3f1ed3ae BUG: Emit StartEvent before a ProgressEvent
Merge topic 'AddExplicitModifiedCall'

9ba4fd98 BUG: Missing Modified() call