Make the Q parameter optional for ECC signing.

* cipher/ecc.c (ecc_sign): Remove the need for Q.
* cipher/pubkey.c (sexp_elements_extract_ecc): Make Q optional for a
private key.
(sexp_to_key): Add optional arg R_IS_ECC.
(gcry_pk_sign): Do not call gcry_pk_get_nbits for ECC keys.
* tests/pubkey.c (die): Make sure to print a LF.
(check_ecc_sample_key): New.
(main): Call new test.
--

Q is the actual public key which is not used for signing.  Thus we
can make it optional and even speed up the signing by parsing less
stuff.

Note: There seems to be a memory leak somewhere.  Running tests/pubkey
with just the new test enabled shows it.

Signed-off-by: Werner Koch <wk@gnupg.org>

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