Changed method to modify time units in cmorization. Changed check inside renamevars from ncdump to cdo showvar because it can detect more errors. Fixes #2

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

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