traits and numeric_limits

[Will Schroeder]

Hi Luis, Jim -

I modified itkNumericTraits.h to include <limits> on the PC, and ../Insight3DParty/vxl/vnl/vnl_numeric_limits.h
on everything else, plus created a #define ITK_NUMERIC_LIMITS. Could you (and anyone with a Unix system)
please check this out...the #ifdef is probably not right for Unix systems because some do have a <limits> file.

Will