web/postkey/models.py: permit non-unique hashes in database

This needed because hosts.txt already contains a duplicates. But we
shouldn't permit adding dups via webinterface.

web/postkey/models.py

@@ -4,7 +4,7 @@ class i2phost(models.Model):
 	# Hostname limit is 67 characters maximum, including the '.i2p'.
 	name = models.CharField("I2P hostname", max_length=67, unique=True)
 	# Maximum key length 616 bytes (to account for certs up to 100 bytes).
-	b64hash = models.CharField("Base 64 hash", max_length=616, unique=True)
+	b64hash = models.CharField("Base 64 hash", max_length=616)
 	description = models.TextField("Description", blank=True)
 	date_added = models.DateTimeField(auto_now_add=True)
 	activated = models.BooleanField(default=False)