159 % qpush/qpop error codes

   160 applying test.patch

   161 applying test1b.patch

   162 applying test2.patch

   163 Now at: test2.patch

   164   % pops all patches and succeeds

   165 Patch queue now empty

   166   qpop -a succeeds

   167   % does nothing and succeeds

   168 no patches applied

   169   qpop -a succeeds

   170   % fails - nothing else to pop

   171 no patches applied

   172   qpop fails

   173   % pushes a patch and succeeds

   174 applying test.patch

   175 Now at: test.patch

   176   qpush succeeds

   177   % pops a patch and succeeds

   178 Patch queue now empty

   179   qpop succeeds

   180   % pushes up to test1b.patch and succeeds

   181 applying test.patch

   182 applying test1b.patch

   183 Now at: test1b.patch

   184   qpush test1b.patch succeeds

   185   % does nothing and succeeds

   186 qpush: test1b.patch is already at the top

   187   qpush test1b.patch succeeds

   188   % does nothing and succeeds

   189 qpop: test1b.patch is already at the top

   190   qpop test1b.patch succeeds

   191   % fails - can't push to this patch

   192 abort: cannot push to a previous patch: test.patch

   193   qpush test.patch fails

   194   % fails - can't pop to this patch

   195 abort: patch test2.patch is not applied

   196   qpop test2.patch fails

   197   % pops up to test.patch and succeeds

   198 Now at: test.patch

   199   qpop test.patch succeeds

   200   % pushes all patches and succeeds

   201 applying test1b.patch

   202 applying test2.patch

   203 Now at: test2.patch

   204   qpush -a succeeds

   205   % does nothing and succeeds

   206 all patches are currently applied

   207   qpush -a succeeds

   208   % fails - nothing else to push

   209 patch series already fully applied

   210   qpush fails

   211   % does nothing and succeeds

   212 all patches are currently applied

   213   qpush test2.patch succeeds