Reduce the tolerance for a LandmarkBasedTransformInitializer test
Reduce the tolerance for a LandmarkBasedTransformInitializer test

With GCC 5.3.1 compiled with "-m32" for i386 architecture the
following test failures occurred:

/scratch/dashboards/SimpleITK-RHEL7-devtool-4-next-m32/SimpleITK/Testing/Unit/sitkBasicFiltersTests.cxx:696:
Failure
The RMS difference between v6(0.0, 0.0, 0.0, 0.0, 0.0, 0.0) and
out.GetParameters() is 2.6893281883974999e-17,
  which exceeds 1e-25

/scratch/dashboards/SimpleITK-RHEL7-devtool-4-next-m32/SimpleITK/Testing/Unit/sitkBasicFiltersTests.cxx:699:
Failure
The RMS difference between v9(0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0, 1.0,
1.0) and out.GetParameters() is 2.6893281883974999e-17,
  which exceeds 1e-25

The difference in tolerance is due to different floating point
precision of FPUs used.

blowekamp/SimpleITK,InsightSoftwareConsortium/SimpleITK,kaspermarstal/SimpleElastix,blowekamp/SimpleITK,richardbeare/SimpleITK,SimpleITK/SimpleITK,SimpleITK/SimpleITK,InsightSoftwareConsortium/SimpleITK,richardbeare/SimpleITK,blowekamp/SimpleITK,blowekamp/SimpleITK,richardbeare/SimpleITK,blowekamp/SimpleITK,richardbeare/SimpleITK,kaspermarstal/SimpleElastix,SimpleITK/SimpleITK,richardbeare/SimpleITK,richardbeare/SimpleITK,blowekamp/SimpleITK,InsightSoftwareConsortium/SimpleITK,kaspermarstal/SimpleElastix,InsightSoftwareConsortium/SimpleITK,InsightSoftwareConsortium/SimpleITK,kaspermarstal/SimpleElastix,richardbeare/SimpleITK,kaspermarstal/SimpleElastix,SimpleITK/SimpleITK,SimpleITK/SimpleITK,kaspermarstal/SimpleElastix,InsightSoftwareConsortium/SimpleITK,InsightSoftwareConsortium/SimpleITK,SimpleITK/SimpleITK,blowekamp/SimpleITK,SimpleITK/SimpleITK,richardbeare/SimpleITK,SimpleITK/SimpleITK,InsightSoftwareConsortium/SimpleITK,kaspermarstal/SimpleElastix,blowekamp/SimpleITK