Log Message:
Changes 5.3.0:
* Support Berkeley DB 5.3.x.
* Drop support for Berkeley DB 4.2 and Python 2.3. Our reference
  is Red Had Enterprise Linux 5, until march 2014.
* Support for "DBEnv->set_intermediate_dir()", available in
  Berkeley DB 4.3-4.6.  Patch by Garret Cooper.
* Support for "DB->set_dup_compare()".  Original patches by
  Nikita M. Kozlovsky and Ben Schmeckpeper.
* Fixed a testsuite compatibility problem with BDB 5.2.
* If we are running Solaris or derivatives, and 64bit python,
  try to find the library under "/usr/local/Berkeley.*.*/64/".
* Solaris 10 Update 10 exposes a very old race condition in the replication
  master election tests. Some details in
  https://forums.oracle.com/forums/thread.jspa?messageID=9902860 .
  Workaround proposed in a private email from Paula Bingham (Oracle),
  in 20110929.
* When doing the full matrix test for a release, stop the verification
  if any test failed.