* verify.c (_gpgme_verify_status_handler): Handle TRUST_* status

* verify.c (_gpgme_verify_status_handler): Handle TRUST_* status
lines so that a claim can be made without looking up the key.
(gpgme_get_sig_string_attr): New.
(gpgme_get_sig_ulong_attr): New.

* gpgme.h (GpgmeAttr): Added GPGME_ATTR_SIG_STATUS.

* rungpg.h: Add new status codes from gpg 1.0.7 and formatted the
list to align with the status.h file from gnupg.

* gpgme.h (GpgmeSigStat): Add _GOOD_EXP and _GOOD_EXPKEY.
* verify.c (_gpgme_verify_status_handler, finish_sig): Handle
these new status codes.  Store the expiration time