introduce upgradingto8-4.tex now, so gotchas that would probably be
forgotten have a place to go.
add detail of event log and fix defn of configuration variable
<SUBSYS>_LOG, because it has been wrong for all time. #4108
Merge branch 'V8_2-branch' of /p/condor/repository/CONDOR_SRC into V8_2-branch
Merge branch 'V8_2-branch' into V8_3_2-branch