Backport of patch:
add ECC strings to ciphers(1), point out difference between DH and ECDH
and backport of other other assorted fixes to this man page
* 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
* update status of static DH (it's now supported)
* backport descriptions of AES128, AES256, AESGCM
* backport descriptions of CAMELLIA128, CAMELLIA256
* backport listing of standard names for ECC cipher suites
and TLSv1.2 cipher suites
* backport description of PSK cipher suites
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