Add --purge to remove command

BUG:FIXES:5935

pisi/atomicoperations.py

@@ -521,6 +521,10 @@ class Remove(AtomicOperation):
                 else:
                     # keep changed file in history
                     historydb.save_config(package_name, fpath)
+
+                    # after saving to history db, remove the config file any way
+                    if ctx.get_option("purge"):
+                        os.unlink(fpath)
             except pisi.util.FileError:
                 pass
         else:

pisi/cli/remove.py

@@ -42,6 +42,8 @@ expanded to package names.
     def options(self):
         group = optparse.OptionGroup(self.parser, _("remove options"))
         super(Remove, self).options(group)
+        group.add_option("--purge", action="store_true",
+                     default=False, help=_("Removes everything including changed config files of the package"))
         group.add_option("-c", "--component", action="append",
                                default=None, help=_("Remove component's and recursive components' packages"))
         self.parser.add_option_group(group)