[postprocessor:compare] extend 'action' option (#1592)

allow setting it to "abort", "terminate", or "exit" as with 'skip'

docs/configuration.rst

@@ -2691,6 +2691,17 @@ Description
     The action to take when files do not compare as equal.
 
     * ``"replace"``: Replace/Overwrite the old version with the new one
+
+    * ``"abort:N"``: Same as ``"replace"`` and stop the current extractor run
+      after ``N`` consecutive files compared as equal.
+
+    * ``"terminate:N"``: Same as ``"replace"``
+      and stop the current extractor run, including parent extractors,
+      after ``N`` consecutive files compared as equal.
+
+    * ``"exit:N"``: Same as ``"replace"`` and exit the program
+      after ``N`` consecutive files compared as equal.
+
     * ``"enumerate"``: Add an enumeration index to the filename of the new
       version like `skip = "enumerate" <extractor.*.skip_>`__