COMP: include ITK before std in SimpleITKTestHarness

This was causing warning MS VS compiler like the following:

include\xutility(2472) : warning C4244: '=' : conversion from 'const
double' to 'float', possible loss of data

Change-Id: I8dd3dc42c5367b29ae2918d5458ceefe80ac11b1
Merge topic 'FixConversionWarningInTestsFromImageAlgorithm' into next

35018c03 COMP: include ITK before std in SimpleITKTestHarness