[ticket/12796] Add view own profile to UCP (and vice versa)

https://tracker.phpbb.com/browse/PHPBB3-12796
PHPBB3-12796

![1](https://cloud.githubusercontent.com/assets/3015760/4626450/7c284254-5381-11e4-9a19-c01663fc6849.png)

I implemented it like this in the UCP, instead of an `<input>` button at the bottom (between "reset" and "submit"), because the link works better as a `<a>`. Otherwise this would require `.fieldset.submit-buttons a` rules.

As for the memberlist_view. I decided to put the `[ Edit ]` link next to the other (admin) links, for consistency.
Please use a different string, something like "Edit profile"
So it's clearer that you can not only edit the username.