[R] Bug in lattice that shipped with R 2.13.0

[Deepayan Sarkar]

Hi all,

I had meant to make this announcement earlier but had forgotten (a
recent bug report reminded me).

The version of lattice that ships with R 2.13.0 has a fairly serious
bug in panel.abline (which would neglect to draw many negative slope
lines). If you use lattice with R 2.13.0, you should update to the
latest version of lattice (0.19-26 or better).

-Deepayan