document that locks must not be aquired in f_event...  (and where they can be safely aquired)
document that locks must not be aquired in f_event...  (and where they
can be safely aquired)

Reminded by:	kib (by LOR #193)
MFC:	3 days

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