fix the issue related to the latest changes to [ and [[ subsetting

git-svn-id: https://hedgehog.fhcrc.org/bioconductor/trunk/madman/Rpacks/flowWorkspace@74353 bc3139a8-67e5-0310-9ffc-ced21a209358
Merge commit '930b0fa1a988ede617be4691abc1557308637d1c' into trunk
close #71
close #72