PR: 3130

Suggested by: Ard Biesheuvel

Conflicts:
	apps/s_server.c

Submitted by: Ard Biesheuvel

Add various functions to allocate and set the fields of an ECDSA_METHOD
structure.

Make DTLS behave like TLS when negotiating version: record layer has
DTLS 1.0, message version is 1.2.

Tolerate different version numbers if version hasn't been negotiated
yet.

(This went into 1.0.2 too, so it's not actually a change
between 1.0.x and 1.1.0.)

the main branch (http://cvs.openssl.org/chngview?cn=19322) later added
to the 1.0.2 branch (http://cvs.openssl.org/chngview?cn=23113), and
thus not a change "between 1.0.2 and 1.1.0".

(Various changes from the master branch are now in the 1.0.2 branch too.)

    - EC_GROUP_cmp shouldn't consider curves equal just because
      the curve name is the same. (They really *should* be the same
      in this case, but there's an EC_GROUP_set_curve_name API,
      which could be misused.)

    - EC_POINT_cmp shouldn't return 0 for ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED
      or EC_R_INCOMPATIBLE_OBJECTS errors because in a cmp API, 0 indicates
      equality (not an error).

    Reported by: king cope

PR: 3125
Submitted by: Kyle McMartin

PR: 3110
Submitted by Corinna Vinschen.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

Avoid occasional up to 8% performance drops.