Add an essential .h file that skipped from the last commit (r185419).
Add an essential .h file that skipped from the last commit (r185419).

Pointy hat #1 on...

Pointed out by:	bz

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