merge from bioc devel

git-svn-id: https://hedgehog.fhcrc.org/bioconductor/branches/RELEASE_2_14/madman/Rpacks/flowWorkspace@90327 bc3139a8-67e5-0310-9ffc-ced21a209358
add validity checking for type argument in plotGate and throw error when plot densityplot with 2d gate
move RSVGTipsDevice from imports to Suggests. #146
move RSVGTipsDevice from imports to Suggests. #146
Merge branch 'trunk'
Merge commit '7705a74a0d83a3c1d0a55b6452f76f5b93ee525c'