Data for aircraft an crew tables is stored twice

[bdeboe]

It struck me that the data for the aircraft and crew tables is no longer accessed in its original ^Aircraft.***D global, but now part of the sub-node storage for the main ^Aircraft.EventD global. However, the original globals are still there.

This wasn't the case in the original C/E example, which had one-to-many relationships, which may be a better fit.