[Rd] eapply duplicates elements unnecessarily

[Martin Morgan]

eapply duplicates the elements of the environment it is being applied to

 > env = new.env(); x = 1; tracemem(x)
[1] "<0x1758cd18>"
 > env[["x"]] = x
 > xx <- eapply(env, length)
tracemem[0x1758cd18 -> 0x1758cbc8]: eapply

but duplication seems unnecessary. I think this is because of 'duplicate' in 
FrameValues (envir.c:2402). It's hard to tell what contract FrameValues is 
living up to, but is  INCREMENT_NAMED() sufficient? (the PROTECT on value in 
line 2398 also seems unnecessary -- it must already be protected?)

Martin
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