Enhanced help for run and restore command

Many available parameters for the restore and
run commands were missing in the help info and so
also in the <tab-tab> completion.

Now we should have hopefully all useful parameters documented
for run and restore.

Also, the tab-completion for "backupclient" and "restoreclient" now
works as it calls ".client"

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