Uniform use of Math::MatrixReal and Math::GSL::Matrix

 Math::Matrix::MaybeGSL interfaces with Math::GSL::Matrix or, if that is not
 available, Math::MatrixReal. The idea behind this module is to allow the
 development of tools that use matrices that will work in pure Perl (using
 Math::MatrixReal) or with extra efficiency using Math::GSL::Matrix.
 .
 Given the two modules API is quite distinct, this module defines its own API,
 using method names from both these modules.