Remove hardcoded user in reports

[chrmongeau]

Currently, the module that generates the pre-processing reports (PPR) has a user hardcoded in the folder where files for reports are stored:

faoswsTrade/modules/pre_processing_report/main.R

Line 53 in 0ee749f

initial = file.path(R_SWS_SHARE_PATH, "mongeau")

It's better to have either a variable with the user who ran the module or (probably better) have the complete trade module to store those files in a non-user specific folder, so that the PPR can be generated always from the files stored in a known location.