ENH: Restore test for ChacoGraphReader

The test and data existed, but the test was not in the CMakeLists.txt
file.

Change-Id: Id5bb1af147a5a296ea51cc2baebf56824a3aa25d
ENH: Restore tests for IO/XML

The tests and data existed, but the tests were not in the CMakeLists.txt
file.

Change-Id: I6adc60d0b5811e86293ca0474e79d029a8693772
Fix problem with Pipeline Mtime when connecting to itk. See Bug id 12684

Change-Id: I3c0912b068f5c717b40b5c0345b5ed54e839b409
Merge topic 'vtkImageImport_pipeline_mtime_fix' into master

540f6d08 Fix problem with Pipeline Mtime when connecting to itk. See Bug id 12684
Merge topic 'Coverage_ChacoGraphReader' into master

fb39b895 ENH: Restore test for ChacoGraphReader
Merge topic 'Coverage_HyperOctreeIO' into master

71382ac3 ENH: Restore tests for IO/XML