distinguish between 'edit profile' and 'show profile'

To my mind, there are three use cases for profile type permissions:

Case A: the site admin wants to store data about users that they don't know about.
Eg,
- whether the user has paid their membership
- comments about the user for forum moderators

Case B: the site admin wants to store data about users that they can see but can't edit.
Eg:
- some sort of ranking or badges for the user

Case C: data that is not relevant to the user unless they have a particular role.
Eg:
- committee members of an organization need extra fields for their position on the committee
- certain types of staff member need extra fields

The current system does not serve case C well at all. If I create a profile type 'committee', then an admin user who has rights to edit that profile sees that tab on all users.

Also, if the admin accidentally edits the committee profile for a user who should not have that data, then the profile is created, and shows on the user page.

I propose two things:

1. Show a message when editing a profile that summarizes who can see the data you are editing. This would be useful in lots of circumstances -- I'll spin this off into another issue.

2. Add a permission for 'Display profile TYPE'. Without this permission, the menu tab should not appear.