STYLE: LabelMap related style fixes.

Change-Id: I58ddbcc785ae66cf276aea3bfc6a257baf6dcf91
BUG: LabelMapToLabelImageFilter wrong superclass in itkTypeMacro.

Change-Id: I4ba93300fd45318ee2febe2e1731b7987de31c9c
BUG: Re-use Superclass typedef's in LabelMapToLabelImageFilter.

Change-Id: I71882db3b7c3786211290908187aba2848c34da5
Merge topic 'GCC48-warnings'

3edc633 BUG: Re-use Superclass typedef's in LabelMapToLabelImageFilter.
38f3e6f BUG: LabelMapToLabelImageFilter wrong superclass in itkTypeMacro.
5fbeaa5 STYLE: LabelMap related style fixes.