Forum OpenACS Improvement Proposals (TIPs): APPROVE: Tip #121: acs_log Logging for APM Upgrade Script Output

but please use db_exec_plsql for consistency with other code (it's separate just in case some DB needs it to be, or perhaps originally the oracle or PG driver needed it to be, it's easy to use it instead of db_string so let's do that since all of the rest of our code does)

Also, make the change on HEAD, not the oacs-5-4 branch, which closed for our last 5.4 release (we hope), 5.4.2 (already in beta)