Fix "explicit instantiation of 'Eigen::Spline' must occur in namespace 'Eigen'" warnings
Fix "explicit instantiation of 'Eigen::Spline' must occur in namespace 'Eigen'" warnings

cjntaylor/eigen,pthulhu/eigen,cjntaylor/eigen,cjntaylor/eigen,pthulhu/eigen,pthulhu/eigen,pthulhu/eigen,pthulhu/eigen,cjntaylor/eigen