+editwikinames needs better unique validation.

[Diogo Matsubara]

Steps to reproduce(using sample data):
1. http://launchpad.dev/people/name12/+editwikinames
2. In Other wiki names fill in wiki base URL http://foo.bar.com and Wiki name
foobar, click on 'Save Changes';
3. Fill the form again and add the same URL of step 2 and a different Wiki
name (e.g foobarino), click 'Save Changes';
4. Change the foobarino Wiki name to foobar and click on 'Save changes';
5. Crash like: OOPS-209B181 ProgrammingError ERROR: duplicate key violates unique constraint "wikiname_wikiname_key"

Recent: OOPS-968H114, OOPS-978C1366, OOPS-978H1248

[Curtis Hovey (sinzui)]

Most recent oops: OOPS-1530D883
IntegrityError: duplicate key value violates unique constraint "wikiname_wikiname_key
wiki_2313074: https://wiki.ubuntu.com/
wiki_2313075: http://en.wikipedia.org/wiki/User:
wikiname_2313074: trideceth12
wikiname_2313075: trideceth12

[Brad Crittenden (bac)]

This page needs to be reworked to be a proper LaunchpadEditForm just like I did for +editjabberids two weeks ago.

[Launchpad QA Bot (lpqabot)]

Fixed in stable r11478 <http://bazaar.launchpad.net/~launchpad-pqm/launchpad/stable/revision/11478>.