Studies on Azole‐to‐Azole Interconversion − An Interesting Case of Absence of a “Primary Steric Effect” in the Ring‐Degenerate Equilibration between ortho‐Substituted 3‐Aroylamino‐5‐methyl‐1,2,4‐oxadiazoles and 3‐Acetylamino‐5‐aryl‐1,2,4‐oxadiazoles in Methanol