'$lim' in 'pscales' allows for partial matching

[MichaelChirico]

Follow-up to #40

lattice/R/splom.R

Lines 171 to 172 in 757d099

	if (is.list(pscales) && !is.null(pscales[[i]]$lim))
	pscales[[i]]$lim

Prior to #40, there was some ambiguity in what is expected here -- the code says $lim but $limits was tested.

Mostly this seems like a documentation/consistency issue -- what values are allowed (design decision), and how is this documented.

If partial matching is allowed intentionally, this should be encoded explicitly, e.g. with [[pmatch("lim", names(pscales[[i]]))]] instead of $lim. Or perhaps just [["lim"]] to prevent partial matching.