Merge branch 't/deprecate_no_default_filters'

diff --cc NEWS
index 16e8e4e,16e8e4e..130c0fc
--- 1/NEWS
--- 2/NEWS
+++ b/NEWS
@@@ -2,6 -2,6 +2,10 @@@
  0.4.10 (to be announced) "heterogeneous vacuum"
  -----------------------------------------------
  
++      - The --no_default_filters option of para_filter has been
++        depricated. It still works but has no effect and will be
++        removed in the next version.
++
  -------------------------------------
  0.4.9 (2011-12-06) "hybrid causality"
  -------------------------------------