* scDD:
  Run checks
  Add scDD tests
  Add scDDSimulate function
  Add scDDEstimate
  Add SCDDParams object

Getting note about scDatEx, but think it should be fine...

* lun2:
  Run checks
  Document lun2Simulate and add tests
  Add lun2Simulate function
  Add lun2Estimate function
  Document Lun2Params
  Add Lun2Params object

* redesign:
  Remove TMP old files
  Add extra tests
  Add lunSimulate tests and run checks
  Add lunSimulate function
  Add lunEstimate function
  Add LunParams object
  Add splatSimulate tests and run checks
  Rename estimation functions
  Modify splatSimulate to use SplatParams
  Add estimateSplatParams and helpers functions
  Add setParamsUnchecked method
  Add splatParams object
  Run checks
  Document new simple simulation
  Add estimateSimpleParams function
  Temporaily move old files
  Modify simSimple to use SimpleParams and rename
  Add S4 SimpleParams class

estimateSimpleParams -> simpleEstimate
estimateSplatParams -> splatEstimate

Neater than having a checkValid option

Make it clearer what is new and old

* lun:
  Run checks
  Fix doc links to other packages
  Document simLun
  Add DE to simLun
  Add addition Lun params to splatParams
  Add basic simLun function

* simple:
  Add tests for simple simulation
  Rename splat sub functions to differentiate
  Add simSimple function