Very "hot" PostgreSQL

From now on PostgreSQL no longer requires reboot on all available operations.
Additionally:
— Bugfix: ``smdba backup-hot --enable=off`` then ``--backup-dir`` was still asked.
— Improve: Better messages on what is going on
— Improve: Updated man page.
@mcalmer Yeehaaa! Thanks to the ``git gui`` and four screens in front of my eyes at the and of the day, I missed that. Added.