Merge branch 'master' into ci

* master: (29 commits)
  Add ImmunoOncology biocViews tag
  Fix bugs in vignette
  Bioconductor 3.9 devel
  Bioconductor 3.8 release version
  bump x.y.z versions to odd y after creation of RELEASE_3_8 branch
  bump x.y.z versions to even y prior to creation of RELEASE_3_8 branch
  Update NEWS for Bioc 3.8 Release
  Add WithSpike when calling BASiCS_MCMC
  Fix BASiSCEstimate tests
  Fix BASiCSEstimate tests
  remove useDevel mention
  Clean up use of biocLite & add BiocManager to Suggests field
  Fix installation instructions
  replace BiocInstaller biocLite mentions with BiocManager
  Build site
  Fix bug in BASiCSEstimate when no spikes
  Fix bug in BASiCSEstimate when no spikes
  Bump version to 1.4.2
  Add regression parameter to BASiCSEstimate
  Add regression parameter to BASiCSEstimate
  ...