fix the names of the bands
fix and simplify the alignment
fix the off-by-one error, again
proper none replacement
allow sixSigma bands for multiple time-series
handle the case when the seriesList is empty
cleanup sixSigma API, reword parameters
Merge branch 'feature/linregress' into is24-master

* feature/linregress:
  cleanup sixSigma API, reword parameters
  handle the case when the seriesList is empty
  allow sixSigma bands for multiple time-series
  proper none replacement
  fix the off-by-one error, again
  fix and simplify the alignment
  fix the names of the bands