Support for VXL complex abs

[hjmjohnson]

Description

The new version of VXL supports the "abs" function from the C++ library, thus allowing for consistent use of "itk::Math::abs(cplxnum)" and "itk::Math::abs(realnum)"

Use of itk::Math::abs for complex numbers requires an updated version of vxl.

Impact analysis

An updated version of VXL

Expected behavior

ITK code works with system VXL and standard VXL.

Actual behavior

Changes in VXL require changes in ITK backward compatibility support.

Versions

ITK Head requires VXL 3.5.0 or better from the system.

Environment

all

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