Changes in quadrature_clough_3D.C for -Wshadow.

Issue #24.
Changes in quadrature_conical.C for -Wshadow.

Issue #24.
Changes in quadrature_conical_2D.C for -Wshadow.

Issue #24.
Changes in quadrature_conical_3D.C for -Wshadow.

Issue #24.
Changes in quadrature_gauss.C for -Wshadow.

Issue #24.
Changes in quadrature_gauss_3D.C for -Wshadow.

Issue #24.
Changes in quadrature_gauss_2D.C for -Wshadow.

Issue #24.
Changes in quadrature_gm_3D.C for -Wshadow.

Issue #24.
Changes in quadrature_grid_2D.C for -Wshadow.

Issue #24.
Changes in quadrature_grid_3D.C for -Wshadow.

Issue #24.
Changes in quadrature_monomial_2D.C for -Wshadow.

Issue #24.
Changes in quadrature_monomial.C for -Wshadow.

Issue #24.
Changes in quadrature_monomial_3D.C for -Wshadow.

Issue #24.
Changes in quadrature_simpson_2D.C for -Wshadow.

Issue #24.
Changes in quadrature_simpson_3D.C for -Wshadow.

Issue #24.