Added a list of known bugs for the old britney, fixed a bug while evaluating nuninst.

BUGS

@@ -0,0 +1,3 @@
+# list of bugs for old britney
+#  * if there are tpu approvals, then all the packages are approved
+#  * while building the upgrade excuses, dependencies on virtual packages can be versioned, but not on UpgradeRun

britney.py

@@ -1519,7 +1519,8 @@ class Britney:
                     if b not in nuninst[arch]:
                         nuninst[arch].append(b)
 
-                if len(nuninst[arch]) > len(nuninst_comp[arch]):
+                if arch not in self.options.break_arches and \
+                   len(nuninst[arch]) > len(nuninst_comp[arch]):
                     better = False
                     break