Fix douar_lamrabet usecase

Problem was tp column was interpreted as integer instead of number,

quickfix was to modify directly in datapackage.json, under the field
"tp" the type from "integer" to "number" and set
skip_infer_datapackage_metadata=True in compute_scenario function in
examples/scripts/compute.py

real fix was to change 0 to 0.0 in the tp column so that the guessed
type is not "integer" but "number"