Fixed mixed timestep when cmorizing atmosphere from grib_files. Started preparation of launcher and installation

Changed order of variable renaming at send_file to avoid errors. Better management of valid_min and valid_max attributes

Created a class to encapsulate al the experiment management (get chunk list, get member str...) functionalities

Minor changes to make the diagnostics more user-friendly. Removed old diagnostics. Added measurement of time consumed by each diagnostic class