Convert internal like to external links for BLFS packages not in the Basic book.
Reorder some chapters.
Merge System V and systemd sections so both are always displayed with proper attribution for system type.
git-svn-id: svn://svn.linuxfromscratch.org/BLFS/branches/basic@20524 af4574ff-66df-0310-9fd7-8a98e5e911e0