Merge branch 'master' into release-3.5

* master: (175 commits)
  Fix comparison plots
  Bioconductor 3.5 release
  bump x.y.z versions to odd y after creation of 3_5 branch
  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
  Version 0.99.14
  Add panel function to vignette
  Change var plot scale
  Run checks
  Update panel functions
  Add makeOverallPanel function
  Add makeDiffPanel function
  Add options to comparison plots
  Version 0.99.13
  ...

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

git-svn-id: https://hedgehog.fhcrc.org/bioconductor/branches/RELEASE_3_5/madman/Rpacks/splatter@129246 bc3139a8-67e5-0310-9ffc-ced21a209358