Previously tutorials were generated from all checklists.
Now <auto-tutorial>false</auto-tutorial> can be set at
any level of the checklist heirarchy to disable generation
of tutorials for a given checklist, group, or for all
checklists.
Checklists now support grouping by placing a group of checklists
under a <group> node.
e.g. /sim/checklists/group/checklist
The group can have a <name>, which is used by the checklist dialog
and can be used by other interfaces, such as the FG1000.
