Fix propagation of negations

While _negations in the Applications type was being properly
initialised, it wasn't copied on merges. This simple fix merely extends
the list, which should work just fine i.e. I don't think it makes sense
to ensure uniqueness here.

Closes: madduck#44
Signed-off-by: martin f. krafft <madduck@madduck.net>

Author: madduck

reclass/datatypes/applications.py

@@ -54,6 +54,7 @@ def merge_unique(self, iterable):
                     self._items.remove(negation)
                 except ValueError:
                     pass
+            self._negations.extend(iterable._negations)
             iterable = iterable.as_list()
         for i in iterable:
             self.append_if_new(i)