Update: Improve entry/exit verbose messages, display exit with -tv, and wait all...

Update: Improve entry/exit verbose messages, display exit with -tv, and wait all with read lock fix.

The verbose messages should be distinguishing between an entry and an exit now.

When both --simulate and --test are specified, the printout should include both the entry and the exit.
Previously, only the entry was printed.

The wait all should only be triggered to wait for all processes at the current moment in time.
Furthermore, the read lock is being held too long (for the entire loop).
Maintain the read lock long enough to build a list of all processes to wait for.