'Protected' is not currently a valid restriction

[smnorris]

Validation of current sources_designations.csv fails:
ValueError: Invalid forest_restriction value Protected for source park_national

[smnorris]

Just adding "PROTECTED": 5 to this lookup might be enough but there may be assumptions elsewhere in the script:

self.restriction_lookup = {
            "FULL": 4,
            "HIGH": 3,
            "MEDIUM": 2,
            "LOW": 1,
            "NONE": 0,
        }