C99 math only functions should be moved to a CXX11 module

Submitted by Gael Guennebaud @ggael

Assigned to Nobody

Link to original bugzilla bug (#1210)
Version: 3.3 (current stable)

Description

In src/Core/SpecialMathFunctions.h several functions seems to be available through C99/C++11 features only. According to our policy, those should be moved to a dedicated CXX11 module:

Eigen/CXX11/Core

CXX11/Tensor would thus include Eigen/CXX11/Core instead of Eigen/Core.

In this module we could also add type aliases as suggested there:

PR-180

OK?

Blocking

#558 (closed)