This follows from the thread:
http://thread.gmane.org/gmane.games.flightgear.devel/81852/focus=81859
All the $FG_ROOT/Models/* files found using a grep command in both FGData and
FGAddon and now missing in FGData were restored to their state at commit f739a7,
the commit prior to the purging of the Models directories. The command used
was:
grep -rI "Models/3ds\|Models/Agriculture\|Models/StreetFurniture\|Models/Structures\|Models/Sport\|Models/Power\|Models/Misc\|Models/Aircraft\|Models/Airport\|Models/Boundaries\|Models/Communications\|Models/Fauna\|Models/Military\|Models/Transport\|Models/Trees\|Models/Industrial\|Models/Residential"