Meta-License of this Additional Permission

Allow everyone to use the text of this Additional Permission to write more
Additional Permissions.

Consider other AGPLv3'd Programs in "No Weakening" clause

This change improves the "No Weakening" clause to deal Programs that are not
this one.

Remove stray comma that might be misunderstood.

The comma after "modified Website Output" makes it read that (a) and (b)
might relate back to "unmodified." It doesn't make sense to read it that way,
but for ease of reading and ensuring clarity I would remove the comma.

Rewrite of main permission text.

This was as Pam sent to bkuhn on the Author-Date in this commit.

Consensus reached to all the output "Website Output"

After much discussion among potential users and others, we'll make this
defined term "Website Output".

remove nor & put names of languages in same order throughout

It's "not HTML, Javascript or CSS" (not nor - the initial negative carries
through to all the enumerated elements. Garner, B. The Oxford Dictionary of
American Usage and Style, Oxford University Press, 2000, pp. 230.) You
should probably switch "Javascript" and "CSS" so all three are always in the
same order.

Formatting changes only: no content changed.

Make title setup match that of the main body of AGPLv3, and refill
paragraphs.