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[FEATURE] Introduces mesh virtual datasets With the mesh calculator the user can choose to create those "virtual" dataset groups that will be added to the layer. Then, for these dataset groups, values are not stored in memory but each dataset is calculated when needed whit the formula entered in the mesh calculator. Those virtual dataset groups are saved with the project. If needed, the user can remove them or can persist them on files to make them persistent. Co-authored-by: Étienne Trimaille <gustrimaille@yahoo.fr>