Add three admin scripts related to deactivation

final-gift.py is based on:
    https://gist.github.com/whit537/ec82f7d908b530336380

untip.py is based on:
    https://gist.github.com/whit537/b876265226c27c258dd0

deactivate-final-rename.py is based on
#54

scripts/deactivate-final-rename.py

@@ -0,0 +1,77 @@
+#!/usr/bin/env python
+"""The final rename and clear step for deactivating an account.
+
+If the account has a balance or is involved in active tips,
+this script will report the problem and abort without making any update.
+
+If the first eight digits of the account's API key are not given or do not match,
+this script will report the problem and abort without making any update.
+
+Usage:
+
+    [gittip] $ heroku config -s -a gittip | foreman run -e /dev/stdin ./env/bin/python ./scripts/deactivate-final-rename.py "username" [first-eight-of-api-key]
+
+"""
+from __future__ import print_function
+
+import sys
+
+from gittip import wireup
+from gittip.models.participant import Participant
+
+
+username = sys.argv[1] # will fail with KeyError if missing
+if len(sys.argv) < 3:
+    first_eight = "unknown!"
+else:
+    first_eight = sys.argv[2]
+
+db = wireup.db()
+
+target = Participant.from_username(username)
+
+INCOMING = """
+        SELECT count(*)
+          FROM current_tips
+         WHERE tippee = %s
+           AND amount > 0
+"""
+
+FIELDS = """
+        SELECT username, username_lower, api_key, claimed_time
+          FROM participants
+         WHERE username = %s
+"""
+
+
+incoming = db.one(INCOMING, (username,))
+fields = db.one(FIELDS, (username,))
+
+print("Current balance ", target.balance)
+print("Incoming tip count ", incoming)
+print(fields)
+
+assert target.balance == 0
+assert incoming == 0
+if fields.api_key == None:
+    assert first_eight == "None"
+else:
+    assert fields.api_key[0:8] == first_eight
+
+deactivated_name = "deactivated-" + username
+print("Renaming " + username + " to " + deactivated_name)
+
+RENAME = """
+        UPDATE participants
+           SET claimed_time = null
+             , session_token = null
+             , username = %s
+             , username_lower = %s
+         WHERE username = %s
+"""
+
+print(RENAME % (deactivated_name, deactivated_name.lower(), username))
+
+db.run(RENAME, (deactivated_name, deactivated_name.lower(), username))
+
+print("All done.")

scripts/final-gift.py

@@ -0,0 +1,61 @@
+#!/usr/bin/env python
+"""Distribute a balance as a final gift. This addresses part of #54.
+
+Usage:
+
+    [gittip] $ heroku config -s -a gittip | foreman run -e /dev/stdin ./env/bin/python ./scripts/final-gift.py "username"
+
+"""
+from __future__ import print_function
+
+import sys
+from decimal import ROUND_DOWN, Decimal as D
+
+from gittip import wireup
+from gittip.models.participant import Participant
+
+db = wireup.db()
+
+username = sys.argv[1] # will fail with KeyError if missing
+tipper = Participant.from_username(username)
+
+
+print("Distributing {} from {}.".format(tipper.balance, tipper.username))
+if tipper.balance == 0:
+    raise SystemExit
+
+claimed_tips, claimed_total, unclaimed_tips, unclaimed_total = tipper.get_giving_for_profile()
+transfers = []
+distributed = D('0.00')
+
+for tip in claimed_tips:
+    if tip.amount == 0:
+        continue
+    rate = tip.amount / claimed_total
+    pro_rated = (tipper.balance * rate).quantize(D('0.01'), ROUND_DOWN)
+    distributed += pro_rated
+    print( tipper.username.ljust(12)
+         , tip.tippee.ljust(18)
+         , str(tip.amount).rjust(6)
+         , str(rate).ljust(32)
+         , pro_rated
+          )
+    transfers.append([tip.tippee, pro_rated])
+
+diff = tipper.balance - distributed
+if diff != 0:
+    print("Adjusting for rounding error of {}. Giving it to {}.".format(diff, transfers[0][0]))
+    transfers[0][1] += diff  # Give it to the highest receiver.
+
+with db.get_cursor() as cursor:
+    for tippee, amount in transfers:
+        assert amount > 0
+        cursor.run( "UPDATE participants SET balance=balance - %s WHERE username=%s"
+                  , (amount, tipper.username)
+                   )
+        cursor.run( "UPDATE participants SET balance=balance + %s WHERE username=%s"
+                  , (amount, tippee)
+                   )
+        cursor.run( "INSERT INTO transfers (tipper, tippee, amount) VALUES (%s, %s, %s)"
+                  , (tipper.username, tippee, amount)
+                   )

scripts/untip.py

@@ -0,0 +1,44 @@
+#!/usr/bin/env python
+"""Zero out tips to a given user. This is a workaround for #1469.
+
+Usage:
+
+    [gittip] $ heroku config -s -a gittip | foreman run -e /dev/stdin ./env/bin/python ./scripts/untip.py "username"
+
+"""
+from __future__ import print_function
+
+import sys
+
+from gittip import wireup
+
+
+tippee = sys.argv[1] # will fail with KeyError if missing
+
+db = wireup.db()
+
+tips = db.all("""
+
+    SELECT amount
+         , ( SELECT participants.*::participants
+               FROM participants
+              WHERE username=tipper
+            ) AS tipper
+         , ( SELECT participants.*::participants
+               FROM participants
+              WHERE username=tippee
+            ) AS tippee
+      FROM current_tips
+     WHERE tippee = %s
+       AND amount > 0
+  ORDER BY amount DESC
+
+""", (tippee,))
+
+
+for tip in tips:
+    print( tip.tipper.username.ljust(12)
+         , tip.tippee.username.ljust(12)
+         , str(tip.amount).rjust(6)
+          )
+    tip.tipper.set_tip_to(tip.tippee.username, '0.00')