Problem using factor to index matrix

* master:
  Fix group factors bug

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

git-svn-id: file:///home/git/hedgehog.fhcrc.org/bioconductor/trunk/madman/Rpacks/splatter@131740 bc3139a8-67e5-0310-9ffc-ced21a209358

* master:
  Change mean-dropout to mean-zeros
  Add verbose to scDDEstimate

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

git-svn-id: file:///home/git/hedgehog.fhcrc.org/bioconductor/trunk/madman/Rpacks/splatter@131415 bc3139a8-67e5-0310-9ffc-ced21a209358

* master:
  Bump version number
  Run checks
  Patch fix to lun2Estimate from basics branch
  Update summariseDiff
  Add counts check to scDDEstimate
  Adjust nEE/nEP estimation
  Update scDD estimation

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

git-svn-id: file:///home/git/hedgehog.fhcrc.org/bioconductor/trunk/madman/Rpacks/splatter@131258 bc3139a8-67e5-0310-9ffc-ced21a209358

Import SummarizedExperiment to avoid warnings

* Add MAE, RMSE
* Add scaled stats
* Add ranks
* Only return long table