jbferet/biodivMapR: biodivMapR v2

biodivMapR v2 includes an updated workflow, with more simple and straightforward application of the full process to produce diversity maps.

• biodivMapR_full is an all in one function to produce the diversity maps.
• minimum intermediate variables saved to reduce the volume of data produced.
• possibility to train biodivMapR with a rastrer and apply the model on independent sites.
• different modalities applicable to biodivMapR for optical data processing are described : spectral transformation, spectral indices.
• improved support for any raster file format, using terra
• more functionalities included, to be described in next documentation versions