COMP: Revert - vtkPichonFastMarching - Replace finite() with isfinite()"

This reverts commit r22819

isfinite() function is not available on windows 2008:

20>47>..\..\..\..\..\..\Slicer4\Modules\Scripted\EditorLib\Logic\vtkPichonFastMarchingPDF.cxx(193) : error C3861: 'isfinite': identifier not found

git-svn-id: http://svn.slicer.org/Slicer4/trunk@22821 3bd1e089-480b-0410-8dfb-8563597acbee