Added superclass chainable-condition to incompatible-arguments in src/conditions.lisp

* src/conditions.lisp (incompatible-arguments): added superclass
  `chainable-condition'; adapted report accordingly
  (incompatible-initargs): adapted report to changed superclasses
* test/conditions.lisp (define-condition-suite): allow skipping
  constructor test cases
  (define-condition-suite incompatible-arguments): added case with
  causing condition; has to be skipped for constructor
  (define-condition-suite incompatible-initargs): likewise