R-alpha: var() and missing

var() handles missing values in a very strange way. It is not what the
documentation says

var(c(NA,1:10))

[1] 0

var(1:10)

[1] 9.166667
This is because sum() handles NA incorrectly

sum(NA)

[1] 0

sum(NA,na.rm=T)

[1] 0

sum(NA,na.rm=F)

[1] 0

This is a bug brought in by changes to complex arithmetic.  I have a
fix and will have a patch (later today I hope).

Also the documentation gives a pairwise= option to var() which isn't in
the function.

I think the interpreted front end doesn't match the real back-end.
I'll change it.
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