Replaced fabs by the std methods to fix errors when using norms with double vectors

git-svn-id: http://www.openmesh.org/svnrepo/OpenMesh/trunk@775 fdac6126-5c0c-442c-9429-916003d36597

src/OpenMesh/Core/Geometry/VectorT.hh

@@ -62,6 +62,7 @@
 
 #include <OpenMesh/Core/System/config.h>
 #include <iostream>
+#include <cmath>
 #include <assert.h>
 #include <math.h>
 #include <string.h>
@@ -300,6 +301,8 @@ typedef VectorT<unsigned int,3> Vec3ui;
 typedef VectorT<float,3> Vec3f;
 /** 3-double vector */
 typedef VectorT<double,3> Vec3d;
+/** 3-bool vector */
+typedef VectorT<bool,3> Vec3b;
 
 /** 4-byte signed vector */
 typedef VectorT<signed char,4> Vec4c;