Merge branch 'master' into devel

* master: (183 commits)
  Run checks
  Add batch effects to vignette
  Update splatEstimate to set batchCells
  Add batch effects to splatSimulate
  Update SplatParams
  Bump version number
  Update citation
  Fix error handling when fitting means
  Fix comparison plots
  Bioconductor 3.5 release
  bump x.y.z versions to odd y after creation of 3_5 branch
  Creating branch for BioC 3.5 release
  bump x.y.z versions to even y prior to creation of 3_5 branch
  Update NEWS and DESCRIPTION
  Version 0.99.15
  Remove dropout.present estimation
  Add limits to zeros plots
  Adjust default splat DE fac params
  Add BPPARAM to scDDSimulate
  Add summariseDiff function
  ...

From: Luke Zappia <lazappi@users.noreply.github.com>

git-svn-id: file:///home/git/hedgehog.fhcrc.org/bioconductor/trunk/madman/Rpacks/splatter@131029 bc3139a8-67e5-0310-9ffc-ced21a209358