Retire -E's "expert" mode. Introduced 23 years ago to avoid

Retire -E's "expert" mode. Introduced 23 years ago to avoid
confusing users with FFS attributes that only experts should
fiddle with. Actual use has withered away with functionality
rendered moot or moved elsewhere.

'-e' remains for the truly obscure corner cases.

Simply excise the code for now to see if hidden users/uses are
exposed.  Further simplifications are possible if no such
users/uses surface.

ok with sthen@ millert@ kn@ otto@