As an authenticated user I should not see the revision log field when editing my profile

Problem/Motivation

As a regular user, with no special roles or permissions, I can see a revision log at the bottom of the edit profile form.

Steps to reproduce

1. Enable social_profile and social_profile_fields
2. Login in as an authenticated user
3. Go to 'Edit my profile' page.

Proposed resolution

The revision log field should only display for users that have the permission to edit all profiles and the field should also not show up if you are editing your own profile, since it does not make sense to set a revision message for it.

Remaining tasks

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User interface changes

The revision field will be hidden on Edit my profile form.

API changes

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Data model changes

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