Log Message:
Update sign to 1.0.7. From Ben Gergely via mail to pkgsrc-users.

* fixed 'test' (-t) mode (kudos to Kai for noticing)
* fixed a bug in error message formatting when the original
  file extension cannot be guessed (--verify mode)
* fixed a bug in key fingerprint formatting routine
* added missing buffer range check in buf_parse_bignum()