Rename and reorder some triple conjunction theorems
Rename and reorder some triple conjunction theorems

Per comments by Norm Megill, rename two triple conjunction theorems as
anandi3 and anandi3r.

Signed-off-by: David A. Wheeler <9ae72d22d8b894b865a7a496af4fab6320e6abb2@dwheeler.com>

metamath/set.mm,metamath/set.mm,metamath/set.mm