BUG: Not restoring ostream format

Coverity reports:
The next output operation may not expect the stream format state being
altered, resulting in incorrectly formatted output.

This is the second attempt to address this defect. This patch uses the
new class itkStdStreamStateSave to save and restore a stream's
format state. If Coverity still complains, I suggest we ignore the
defect since the new class certainly addresses the defect.

Change-Id: I3f5959f600c6c8721d3bbb57a682eda5babf249c
Merge topic 'Coverity_RestoreStreamFormat2'

db8ee172 BUG: Not restoring ostream format