[R-sig-ME] Caution - Big changes in lme4 on Saturday

[hadley wickham]

> Please be cautious about installing the new version if you depend on
> using mcmcsamp in its current form.  It would be a good idea to keep a
> backup copy of the current CRAN version of the lme4 package in case
> you find you want to back out the change.

For those of you who don't already know about it, the installWithVers
parameter to install.packages may be of use.  This allows you to keep
previous versions of the package around and refer to them by package
version.

Hadley

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