Restored most of suggestion about using NULL, even though wollman disagrees with it personally :-), and fixed the misleading parts.
Restored most of suggestion about using NULL, even though wollman
disagrees with it personally :-), and fixed the misleading parts.

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