mpi: Support printing of negative numbers.
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mpi: Support printing of negative numbers.

* mpi/mpicoder.c (twocompl, onecompl): New.
(gcry_mpi_print): Use it for STD and SSH.
(gcry_mpi_scan): Use it for STD and SSH.  Always set NSCANNED.
(gcry_mpi_aprint): Clear the extra allocated byte.
* tests/t-convert.c (showhex, showmpi): New.
(mpi2bitstr_nlz): New.
(check_formats): New.
(main): Call new test.