gpg,gpgsm: Add option --min-rsa-length.
* common/compliance.c (min_compliant_rsa_length): New. (gnupg_pk_is_compliant): Take in account. (gnupg_pk_is_allowed): Ditto. (gnupg_set_compliance_extra_info): New. * g10/gpg.c (oMinRSALength): New. (opts): Add --min-rsa-length. (main): Set value. * g10/options.h (opt): Add field min_rsa_length. * sm/gpgsm.c (oMinRSALength): New. (opts): Add --min-rsa-length. (main): Set value. * sm/gpgsm.h (opt): Add field min_rsa_length.