Updating layer_diagram with matrix and nicer fonts.
Removing "throw (io_error)" from file::serve().
Adding two more lines to the compilation/installation docs.
Fixing lcov/genhtml coverage parameters, adding --no-branch-coverage.
Fixing integer underflow in PQ config, rewriting PQ template metaprogram for legibility.
Skipping compile of PQ with 8 GiB on 32-bit systems, duh.
Merge branch 'master' into unordered_map