Add SLIST_EMPTY, SLIST_FIRST, SLIST_NEXT.
Add SLIST_EMPTY, SLIST_FIRST, SLIST_NEXT.

Is it time to split this into one "intro" type and a number of
detailed pages ?

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase