Add Copyright and license.

Merge the documentation of six additional functions from OpenSSL.

There are some differences between OpenSSL and LibreSSL, for example
we don't have CRYPTO_free_ex_index(), CRYPTO_EX_INDEX_EC_KEY,
and CRYPTO_EX_INDEX_APP.  I hope i got the differences right.

"if you don;t get any feedback promptly i say just go ahead" jmc@

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