Add NaNHelper utility

The aim of this helper is to allow to print signaling NaN. This should help to debug uninitialized matrices of vectors values while printing them.

src/algebra/CRSMatrixDescriptor.hpp

@@ -4,6 +4,7 @@
 #include <algebra/CRSMatrix.hpp>
 #include <utils/Array.hpp>
 #include <utils/Exceptions.hpp>
+#include <utils/NaNHelper.hpp>
 
 #include <map>
 
@@ -105,10 +106,10 @@ class CRSMatrixDescriptor
           }();
 
           if (j_index < overflow_index) {
-            os << ' ' << A.m_column_indices[A.m_row_map[i] + j] << ':' << A.m_values[A.m_row_map[i] + j];
+            os << ' ' << A.m_column_indices[A.m_row_map[i] + j] << ':' << NaNHelper(A.m_values[A.m_row_map[i] + j]);
             ++j;
           } else {
-            os << ' ' << i_overflow->first << ':' << i_overflow->second;
+            os << ' ' << i_overflow->first << ':' << NaNHelper(i_overflow->second);
             ++i_overflow;
           }
         }