merge from git

git-svn-id: https://hedgehog.fhcrc.org/bioconductor/trunk/madman/Rpacks/openCyto@85171 bc3139a8-67e5-0310-9ffc-ced21a209358
disable multicore in vignettes
Merge commit '2697d78003960e66d27c31e0db15337b6490343f' into trunk
1.add .flowDensity.1d and .flowDensity.2d functions 2.use .flowDensity asthe dispatcher. 3. fix the bug in .checkFormals #62
fix typo