Remove ArrayHandle CopyInto
When investigating issue #169 (closed) I noticed that the significant majority of implicit and custom ArrayHandles don't implement the CopyInto method.
On a second look I don't see anyone inside of VTK-m using CopyInto now that the vtkm::interop code has been switched over to use DeviceAdapter::Copy ( !884 (merged) )
Does anybody have any objections with us just straight up removing ArrayHandle::CopyInto entirely?