Interned pathnames propagating bad information (old subject!)

[MOON at SCRC-TENEX]

Renaming Set Package to Set Buffer Package and making a new Set Package
command that updates the -*- line would be all right with me.  I assume
there would also be Set Base, Set Mode, and maybe Set Lowercase.  Since
the command would be changed grossly incompatibly (modifying the buffer)
it might be wise to call the new command Set File Package and make
Set Package nonexistent.