[SCL] ellipsis for seqvar notation

[Pat Hayes]

Comments requested on the following proposed change.

Mark Stickel suggests that we adopt the ellipsis (three dots, ...) as 
the distinctive prefix for a seqvar, rather than the @ symbol.  This 
is quite attractive, as it more directly conveys the sense of 'and so 
on' that is captured by the use of seqvars, and it frees up a symbol 
which already has other uses in some contexts, most notably in email 
address formats.  So

(R x y @z)

becomes

(R x y ...z)

Mark also suggests that the syntax be allowed to use just the 
ellipsis as a seqvar, so that unless one uses two in a single 
expression, there would be no need to decorate the ellipsis with any 
further lexical stuff. The result is even more elegant:

(R x y ...)

Any objections?? If I don't hear any I will make this change to the 
core syntax.

Pat


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