Mapping Manual Ch 4

Mapping Manual Ch 4 final-update
Revised by J. Tidblad, 09/07/2021 after discussions at the ICP Materials Task Force 5-7/05/2021 and
comments by T. Grøntoft, A. Verney Carron and J. Tidblad 12/07/2021, and T. Torretta 1/09/2021