BUG: Add unsigned int concept check to LabelVoting filter

COMP: Don't instantiate LabelVoting with signed integer in WrapITK

Fix a potential use of negative index when a negative label was set on
input.

WrapITK instantiates this filter with signed integers. The patch
addressed the following warnings:

ITK/Modules/Segmentation/LabelVoting/include/itkLabelVotingImageFilter.hxx:116:
warning: comparison between signed and unsigned integer expressions

ITK/Modules/Segmentation/LabelVoting/include/itkLabelVotingImageFilter.hxx:132:
warning: comparison between signed and unsigned integer expressions

Change-Id: Iefa08693a557d7f0ab9feca245685c581cea7c0f
COMP: Disable conversion warning for std::copy in ImageAlgorithm

Include xutility header in itkWin32Header before most other places,
and place the MSVC warning suppression around it.

Change-Id: Ie157d99d1611d11076da2a03ca9efb1982eda302
Merge topic 'FixMSVCStdCopyConversionWarning'

1e868ab COMP: Disable conversion warning for std::copy in ImageAlgorithm
Merge topic 'LabelVotingSignedInput'

e814ccb BUG: Add unsigned int concept check to LabelVoting filter