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Add bulk certification mode to certify widget

Description

Add bulk certification mode to certify widget

* shows slightly different info label
* shows warning if one or more certificates cannot be certified
* shows the primary user IDs and the fingerprints of the certificates
* the primary user IDs of certificates that cannot be certified are
  disabled and cannot be checked; tool tip shows reason
* the primary user ID of the chosen certification certificate is
  (temporarily) disabled and unchecked
* hides the trust signature options