fix 'hf iclass writebl' and 'hf iclass clone' (#896)

* check for correct responses after block updates
* reduce number of tries from 10 to 3
* Allow to override warning on attempt to clone blocks < 5
* add same warning and override option to 'hf iclass writebl'
* some reformatting and minor refactoring
* Drop field after dump and clone functions
* If dumping AA1 with Credit Key, authenticate as Debit Key
* Initialize reader when beginning to clone