BUG: initialize member variables in LabelVoting filter

Valgrind defects were detected in SimpleITK by printing before
execution. Member variables were not initiated in the constructor.

Change-Id: I572c38b3b363aee48ef143583f62fe12b902b4a2
BUG: Add missing cmake file for MRCIO and wrapITK

This patch addresses the failing PythonImageIOCoverage test.

Change-Id: Id7c89fefc60e420440b7e30f77cdff9e22efa35b
Merge topic 'FixMRCIOWrapITK'

2af0854 BUG: Add missing cmake file for MRCIO and wrapITK
Merge topic 'FixLabelVotingUninitialized'

f6ac7ea BUG: initialize member variables in LabelVoting filter