Merge branch 'basics'

* basics:
  Add BASiCS to lists
  Run checks
  Convert to SingleCellExperiment
  Fix lun2Estimate error
  Fix lun2Estimate error
  Fix default MCMC iterations
  Add estimation without spike-ins
  Set default MCMC iterations
  Update BASiCSParams print method
  Add BASiCS to listSims
  Add require check to newBASiCSParams
  Add BASiCSEstimate
  Updata BASiCSParams docs
  Add batches to BASiCSSimulate
  Add batch parameters
  Add BASiCSSimulate function
  Add nSpikes parameter
  Add BASiCSParams tests
  Add BASiCSParams class