[Rd] eapply() fails on baseenv() (PR#8761)

[murdoch at stats.uwo.ca]

eapply() works on most environments, but not on baseenv().  For example,

 > x <- 1
 > eapply(globalenv(), function(x) x)
$x
[1] 1

 > eapply(baseenv(), function(x) x)
list()

I'm probably not going to have time to work on this before 2.3.0, but I 
don't think it's really urgent; if no one else fixes it first I'll do it 
after the release.

Duncan Murdoch