Add tests for matrix notation

preprocessor

tests/.gitignore

tests/Makefile.am

tests/matrix_notation/benchmark.mod

tests/matrix_notation/deterministic_matrix.mod

tests/matrix_notation/deterministic_scalar.mod

tests/matrix_notation/extFunFirstDerivMatrix.m

tests/matrix_notation/extFunNoDerivsMatrix.m

tests/matrix_notation/extFunWithFirstAndSecondDerivsMatrix.m

tests/matrix_notation/first_and_2nd_deriv_given_matrix.mod

.../matrix_notation/first_and_2nd_deriv_given_matrix_dll.mod

tests/matrix_notation/first_deriv_given_matrix.mod

tests/matrix_notation/first_deriv_given_matrix_dll.mod

tests/matrix_notation/no_deriv_given_matrix.mod

tests/matrix_notation/no_deriv_given_matrix_dll.mod

tests/matrix_notation/stochastic_matrix.mod

tests/matrix_notation/stochastic_scalar.mod