RDBAccessSvc+GeoModelSvc+AmdcDb: Thread-safety check updates
Pending changes to the thread-safety checker warn about potentially unsafe uses of coral::AttributeList. Add annotations here to suppress these warnings as needed.
As part of this, need to change getTagDetails so that it is not returning an AttributeList by value. Instead, pass a list via nonconst reference.
Also move the thread-safety checker flag file to the header directory.