clfilter: ensure that hidden filtering is working on all commands

Now that hidden changeset are filtered for all commands, we test
the behavior of `heads` and `summary` regarding hidden changeset.

tests/test-obsolete.t

@@ -128,6 +128,64 b' Check that graphlog detect that a change'
      summary:     add a
   
 
+check that heads does not report them
+
+  $ hg heads
+  changeset:   5:5601fb93a350
+  tag:         tip
+  parent:      1:7c3bad9141dc
+  user:        test
+  date:        Thu Jan 01 00:00:00 1970 +0000
+  summary:     add new_3_c
+  
+  $ hg heads --hidden
+  changeset:   5:5601fb93a350
+  tag:         tip
+  parent:      1:7c3bad9141dc
+  user:        test
+  date:        Thu Jan 01 00:00:00 1970 +0000
+  summary:     add new_3_c
+  
+  changeset:   4:ca819180edb9
+  parent:      1:7c3bad9141dc
+  user:        test
+  date:        Thu Jan 01 00:00:00 1970 +0000
+  summary:     add new_2_c
+  
+  changeset:   3:cdbce2fbb163
+  parent:      1:7c3bad9141dc
+  user:        test
+  date:        Thu Jan 01 00:00:00 1970 +0000
+  summary:     add new_c
+  
+  changeset:   2:245bde4270cd
+  user:        test
+  date:        Thu Jan 01 00:00:00 1970 +0000
+  summary:     add original_c
+  
+
+
+check that summary does not report them
+
+  $ hg init ../sink
+  $ echo '[paths]' >> .hg/hgrc
+  $ echo 'default=../sink' >> .hg/hgrc
+  $ hg summary --remote
+  parent: 5:5601fb93a350 tip
+   add new_3_c
+  branch: default
+  commit: (clean)
+  update: (current)
+  remote: 3 outgoing
+
+  $ hg summary --remote --hidden
+  parent: 5:5601fb93a350 tip
+   add new_3_c
+  branch: default
+  commit: (clean)
+  update: 3 new changesets, 4 branch heads (merge)
+  remote: 3 outgoing
+
 Check that public changeset are not accounted as obsolete:
 
   $ hg --hidden phase --public 2