0.04	10 November 2019
	Adoption.

0.03	31 March 2012
	Added some pod.  Made sure it runs with 5.14.2, threaded and unthreaded.

0.02	4 December 2004
	Added a real test-suite.

	Added THEORY OF OPERATION section, as well as documentation of all
	the new features.

	Added simple debugging output, activated with the OGD_DEBUG
	environment variable.

	Added configurable cleanup interval with OGD_CLEANUP environment
	variable.

	Fixed problem with cleanup interfering with weakening of references.

0.01	3 December 2004
	First version of ogd.