Changes in nemesis_io_helper.C for -Wshadow.

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

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

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

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

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

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

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

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

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

Issue #24.