Stable release 6.0.5.

Stable release version 6.0.4.

Stable release version 6.0.3.

Stable release version 6.0.2.

Stable release version 6.0.1.

Begin version 7 development.

Stable release version 6.0.0.

Version 6.0.0 release candidate 2.

Version 6.0.0 release candidate 1.

Stable release 5.1.12.

Stable release 5.1.11.

Stable release 5.1.10.

Stable release 5.1.9.

Stable release 5.1.8.

5.1.7 stable release.

5.1.6 stable release.

5.1.6 release candidate 1

5.1.5 stable release.

Tag release 5.1.5-rc1.

Change development version tag to 5.99.0.