Tidy and improve examples

Split into functions, can now actually tell how it works...

git-svn-id: https://hedgehog.fhcrc.org/bioconductor/branches/RELEASE_3_5/madman/Rpacks/splatter@129128 bc3139a8-67e5-0310-9ffc-ced21a209358

* master:
  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@128698 bc3139a8-67e5-0310-9ffc-ced21a209358

* master:
  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: https://hedgehog.fhcrc.org/bioconductor/trunk/madman/Rpacks/splatter@128698 bc3139a8-67e5-0310-9ffc-ced21a209358

* master:
  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

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

git-svn-id: file:///home/git/hedgehog.fhcrc.org/bioconductor/trunk/madman/Rpacks/splatter@127789 bc3139a8-67e5-0310-9ffc-ced21a209358

* master:
  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

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

git-svn-id: https://hedgehog.fhcrc.org/bioconductor/trunk/madman/Rpacks/splatter@127789 bc3139a8-67e5-0310-9ffc-ced21a209358

* master:
  Version 0.99.13
  Run checks
  Update Lun2 documentation
  Modify Lun2Params to use data.frame

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

git-svn-id: file:///home/git/hedgehog.fhcrc.org/bioconductor/trunk/madman/Rpacks/splatter@127694 bc3139a8-67e5-0310-9ffc-ced21a209358

* master:
  Version 0.99.13
  Run checks
  Update Lun2 documentation
  Modify Lun2Params to use data.frame

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

git-svn-id: https://hedgehog.fhcrc.org/bioconductor/trunk/madman/Rpacks/splatter@127694 bc3139a8-67e5-0310-9ffc-ced21a209358

Store gene parameters in data.frame rather than separate vectors. Forces them
to be same length and allows more independence between gene parameters and
nGenes. Checking for differences between the number of gene parameters and
nGenes, and sampling if necessary, is now done in `lun2Simulate` rather than
`validObject`. The same is true for nCells and lib.sizes.

* master:
  Version 0.99.12
  Run checks
  Warn if bcv.df is infinite
  Update addFeatureStats col names
  Update progress message
  Switch to boxplots in compareSCESets
  Change Lun2 nGenes estimate
  Add diffSCESets to vignette
  Add diffSCESets function

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

git-svn-id: file:///home/git/hedgehog.fhcrc.org/bioconductor/trunk/madman/Rpacks/splatter@127605 bc3139a8-67e5-0310-9ffc-ced21a209358

* master:
  Version 0.99.12
  Run checks
  Warn if bcv.df is infinite
  Update addFeatureStats col names
  Update progress message
  Switch to boxplots in compareSCESets
  Change Lun2 nGenes estimate
  Add diffSCESets to vignette
  Add diffSCESets function

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

git-svn-id: https://hedgehog.fhcrc.org/bioconductor/trunk/madman/Rpacks/splatter@127605 bc3139a8-67e5-0310-9ffc-ced21a209358

* master:
  Version 0.99.11
  Run checks
  Fix mean-zeros scale
  Make lun2Estimate parallel
  Allow non-interger Lun 2 lib sizes
  Fix dropout eta

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

git-svn-id: file:///home/git/hedgehog.fhcrc.org/bioconductor/trunk/madman/Rpacks/splatter@127511 bc3139a8-67e5-0310-9ffc-ced21a209358