Begin Eigen3 interfacing [ci-skip]

CMakeLists.txt

src/algebra/Eigen3Utils.hpp

src/algebra/LinearSolver.cpp

src/algebra/LinearSolverOptions.hpp

src/utils/BuildInfo.cpp

src/utils/BuildInfo.hpp

src/utils/PugsUtils.cpp

src/utils/pugs_config.hpp.in

tests/CMakeLists.txt

tests/test_Eigen3Utils.cpp

tests/test_LinearSolver.cpp

tests/test_LinearSolverOptions.cpp

tests/test_PugsUtils.cpp