Minor refactorization to make the scalability and traces copy work with other models, plus increase roubstness wrt workflow part 1

[Issue#44]: function scatter_plots now takes as input name of lines to plot. Moreover moved function from curation.py to parser.py, that was a very weird logic ...

[Issue#44]: small refactoring of read_argument function, and added hardcoded dictionary for generating different scatterplot

Added a Python script to transform ifs.stat and Forecast files to a pkl file with the needed structure