Problems running workflow_introduction.jl + solution

[SariKerckhove]

I cloned the repository and tried to run the example code workflow_introduction.j. However I had multiple errors trying to load the data, containing several of the issues reported before (#133 , #131). I adjusted some things in the load_data.jl file and now I can load the data.

line 114
data_df=CSV.read(joinpath(data_path,data_name*".csv"), DataFrame ;strict=true)

line 132-133

   data_selected=data[in.(data[!, year_name],[years]),:] 
    for column in zip(Symbol.(names(data_selected)), eachcol(data_selected))

line 155
if name in Symbol.(names(df))

line 161
col_name!=:none || Base.error("No $(name_itr) in $(repr(df)).")