merge from git

git-svn-id: https://hedgehog.fhcrc.org/bioconductor/trunk/madman/Rpacks/openCyto@81475 bc3139a8-67e5-0310-9ffc-ced21a209358
import ldply #57
Merge commit '19afd7a82deb7d3d7c3f196b98e418030058d031' into trunk