Do NBF commands with a table giving the name of the command, an

"smb_fdata()" string for non-verbose mode (all on one line), and an
"smb_fdata()" string for verbose mode.  Add entries for a number of
additional commands.

Don't look for an SMB packet except in Datagram, Broadcast Datagram,
Data First/Middle, or Data Only/Last NBF packets.