Allow a way to enter adsense account number without using Profile

For developers using node profile or not using the revenue sharing option, it's very inconvenient to have the adsense CLIENT_ID stored in the profile table. This causes the CLIENT_ID_PROFILE_FIELD to show up on every user's profile whether it's used or not.

Have a flag that can be set to: "no revenue sharing." In this case, store the adsense account number in some other table, like variables, so that the field does not show up in the user profile.

Or perhaps an easier way would be to search for a "client_id.txt" file that stores the record.