gnupg: Agent IMPORT

 
 2.6.4 Importing a Secret Key
 ----------------------------
 
 This operation is not yet supported by GpgAgent.  Specialized tools are
 to be used for this.
 
    There is no actual need because we can expect that secret keys
 created by a 3rd party are stored on a smartcard.  If we have generated
 the key ourselves, we do not need to import it.