Update usage messages for all utility programs.

In the years that have passed new options have been added to several
utility programs. Lets add them to the documentation.

Fixes #238: bscan documentation misses the database type parameter
Correct typo "date" -> "data"

Spooling data prevents interleaving date from several job...

Fixes #242: Correct typo "date" -> "data"

Signed-off-by: Marco van Wieringen <marco.van.wieringen@bareos.com>
Correct default value of "Allow Duplicate Jobs"

Since bacula commit f91db64cb5dd84e91c3b077e19bfb6f803795f1e the
default of "Allow Duplicate Jobs" has been yes instead of no as the
manual states.

Fixes #241: Correct default value of "Allow Duplicate Jobs"

Signed-off-by: Marco van Wieringen <marco.van.wieringen@bareos.com>