Fixed bug in Row() method of ColumnIterator

SpMat.h

@@ -164,7 +164,7 @@ public:
     }
     ~ColumnIterator() {}
     T operator*() const { return(*_val_it); }
-    unsigned int Row() const { return(*_ri_it); }
+    unsigned int Row() const { return((*_ri_it)+1); }
     bool operator==(const ColumnIterator& rhs) const { return(_val_it == rhs._val_it); }
     bool operator!=(const ColumnIterator& rhs) const { return(!(*this == rhs)); }
     // Prefix increment. Use whenever possible