v2.2.0-alpha.1

This version incorporated several important bug fixes and internal code improvement.

Bug fixes

1. Fixed an issue that the flux is not conserved in "*.spec2d.fits" files.
2. Fixed an issue that 1d spec of "extended-*" recipe is incorrectly calculated with incorrect weighting.
3. Fix parameter for LA-Cosmic is not properly handled.

Please check the updated How to run pipeline page. Also check the 1-d spectra extraction page for the extraction options.