Comment 2 for bug 1667522

What I think we need for this patch is for it to be able to do the following:

* Add a new switch to the Institution configure page called "Change institution allowed"

So that when "Registration allowed" is set to 'No' users can still change institution if the "Change institution allowed" is set to 'Yes'

And conversely when "Registration allowed" is set to 'Yes' and "Change institution allowed" is set to 'No' they can register for an Institution but cannot then try and join another institution.

The "Confirm registration" switch would be for both the other switches, ie whether you are registering for the site or joining from another institution you will need to confirm if "Confirm registration" is set to 'Yes'

The current patch (8478) only removes selecting the Institution from register form - which does not seem like what we want.