fixed more documentation for the one_dim
typo in lumped test, am241 index number.
fixed @TODO syntax.
added notions of mat tables to one_dim_ppm.
added initialization tests that failed, then implemented a solution and now they pass.
adds more depth to the copy test
using a percent value for porosity, the copy test now passes.
reinstating some tests
reinstating some extraction tests
reinstating some set_porosity tests
reinstating some nuclide transport tests
reinstating some nuclide transport tests
passes extract