Changes to integer-gmp(2) testsuite

Changes to integer-gmp:
commit d466dfc855542c5ebfff718e9decab3e469ba08a
Author: Herbert Valerio Riedel <hvr@gnu.org>
Date:   Mon Oct 28 20:13:35 2013 +0100

    Expose two GMP primality operations

    This exposes `mpz_probab_prime_p()` and `mpz_nextprime()` as
    `testPrimeInteger` and `nextPrimeInteger` respectively and is especially
    useful for cryptographic algorithms such as RSA.

    Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>

commit 4d7cd68b3c6fd87e80d178f1433f3b67e16a6b98
Author: Herbert Valerio Riedel <hvr@gnu.org>
Date:   Sun Oct 27 23:14:11 2013 +0100

    Add side-channel attack resilient `powModSecInteger`

    This is a follow-up to 97c101b7363f84d925a600acb56a9fa3a997ea0d which
    introduced the "ordinary" `powModInteger` operation.

    Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>

Changes to testsuite:
commit 60c7688350c9c3d5672c17c21184346f2a785a23
Author: Herbert Valerio Riedel <hvr@gnu.org>
Date:   Mon Oct 28 21:46:16 2013 +0100

    Add tests for new internal GMP primitives

    This adds some simple tests for the primitives introduced
    in [4d7cd68b/integer-gmp] and [d466dfc8/integer-gmp].

    Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>