Complete rework of global math functions and NumTraits.

* Now completely generic so all standard integer types (like char...) are supported.
** add unit test for that (integer_types).
* NumTraits does no longer inherit numeric_limits
* All math functions are now templated
* Better guard (static asserts) against using certain math functions on integer types.

test/cwiseop.cpp

@@ -24,6 +24,7 @@
 // Eigen. If not, see <http://www.gnu.org/licenses/>.
 
 #define EIGEN2_SUPPORT
+#define EIGEN_NO_STATIC_ASSERT
 #include "main.h"
 #include <functional>
 
@@ -109,7 +110,7 @@ template<typename MatrixType> void cwiseops(const MatrixType& m)
   VERIFY_IS_APPROX(m3, m1.cwise() * m2);
 
   VERIFY_IS_APPROX(mones,    m2.cwise()/m2);
-  if(NumTraits<Scalar>::HasFloatingPoint)
+  if(!NumTraits<Scalar>::IsInteger)
   {
     VERIFY_IS_APPROX(m1.cwise() / m2,    m1.cwise() * (m2.cwise().inverse()));
     m3 = m1.cwise().abs().cwise().sqrt();