Backport of the patch:
add ECC strings to ciphers(1), point out difference between DH and ECDH
and few other changes applicable to the 1.0.1 code base.
* Make a clear distinction between DH and ECDH key exchange.
* Group all key exchange cipher suite identifiers, first DH then ECDH
* add descriptions for all supported *DH* identifiers
* add ECDSA authentication descriptions
* add example showing how to disable all suites that offer no
authentication or encryption
* backport listing of elliptic curve cipher suites.
* backport listing of TLS 1.2 cipher suites, add note that DH_RSA
and DH_DSS is not implemented in this version
* backport of description of PSK and listing of PSK cipher suites
* backport description of AES128, AES256 and AESGCM options
* backport description of CAMELLIA128, CAMELLIA256 options
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