separating out ARGE surveys from badly recorded Jenny&Olly surveys

core/models/survex.py

@@ -214,6 +214,7 @@ class SurvexBlock(models.Model):
 
     legsall = models.IntegerField(null=True)  # summary data for this block
     legslength = models.FloatField(null=True)
+    foreigners = models.BooleanField(default=False)
 
     class Meta:
         ordering = ("id",)