prepare_action_value.Rd
`prepare_action_value()` prepares values of actions and yields for each crop in `typo`.
prepare_action_value(path, typo)
csv files of cost of actions, sale price and yield for each crop in `typo`
`prepare_action_value()` uses the order of elements in `path[["extent"]]` to extract action values and yields for each crop in coherence with `typo`.
If `typo` is missing, it will be read from the "floodam.csv" file in the first extent of `path[["extent"]]`.