2.0.13:

* signal_emit::emit(): Ensure the correct order of 
  destruction of the member variables, to avoid a leak.
  (Andreas Ames, bug #306249)
* Allow recursive signal emission again.
  (Neal E. Coombes, bug #303896)
* SUN Forte CC 5.5 build fixes:
  - test_compatibility minor fix.
  - visit_each() template specializations: 
  Mention the bool I_derives_trackable template type,
  (Friedemann Kleint, bug #305647)
 - Check for the non-standard SUN reverse_iterator,
  and use alternative code if necessary.
  (Murray Cumming)