Make it so that "load iar / ..." does not save the 'root' "My Inventory" folder.

Really "My Inventory" is just the name of the root, it isn't a folder in its own right.
This also makes it more intuitive for users to save whole inventory iars for backup/later restoration, as they don't need to remember to use /*
/* will still work and this is a special case just for the root
If you want to save only the contents of other folders (rather than the folder itself), you still need to specify something like a/b/*
Added a regression test for this case.