GitLab

Except for when the user is prompted for Yes or No, all output now goes through
the logging framework

0 on success (or upgrade aborted by user)
1 on check and need update
2 on check and version of db too high
3 on command-line error
4 on db read error
5 on upgrade error

1. Fix minor gremlins in unit test and main program
2. Update to rename b10-dbutil process (and so avoid an error
from the process_rename_test check).
3. With (2), add run_dbutil to run in test mode