MicroID on profile pages

We should output [[http://microid.org/ | MicroID]]s for user pages. There should be a setting in the profile section to turn this off, but it should be on by default.

-> Patch here: http://identi.ca/notice/123335 -- mikenz

-> I have a number of issues with the current implementation:
-> 1. in the current profile microID defaults to "on" for both email address and XMPP - default should be off
-> 2. while providing a microID is a nice idea, it SHOULD NOT be tied '''automatically''' to either email address or jabber address: neither of these are necessarily stable (they are not for me) and changing then would necessitate to re-claim your profile URL. I'm on my third jabber address already (2nd for identi.ca) because servers may simply stop working; when I go traveling, I'd change my contact email for identi.ca for one that I can access securely while traveling. The microID spec allows using '''any''' two URIs; teh user's URI does not have to be an email or jabber address.
-> I think it should work as follows:
-> 1. on the '''main''' profile page provide a checkbox to turn on/off generating a microID plus a textbox to provide a URI that you control
-> 2. URI could be email, jabber, URL; for a URL an openID URL could be used. In any case a URI controlled by and provided by the user ''independent'' of what the current email and/or jabber address used for identi.ca happens to be
-> 3. that way, a URL can be "claimed" and be stable even when email and jabber addresses change
->[[~Marjolein Katsma]]