Make list buffers know about support buffers

[Steven C. Bagley <bagley at MIT-OZ>]

In zwei in Release 5.1, Experimental MIT 1.5, FEP 18, on Lisp Machine Janis Joplin (3600):

It would be nice if there was some way to get M-X List Buffers not to
list the support buffers.  Right now, you can sort of get that by giving
it a numeric argument and then a string not contained in any support
buffer name (e.g. ":"), but this is kludgy, and not really the right
thing, since it will miss buffers like *buffer-1*.