Logo Usage Policy needs work

The language of the logo usage policy needs work. The policy governing use of the logo in the documentation which goes into a release should be adjusted to ensure that third parties do not lose the ability to freely create derivative works which incorporate parts or all of Boost. How the logo is handled in this case needs to be well-defined.

And, this issue is appropriate for discussion of any areas of the policy, with the goal to ensure that a balance is struck between honoring the spirit of the BSL while protecting the logo from misuse.