* Create project in Mercurial at BitBucket, alongside Cedar Backup 2.
* Convert to Python 3, using v2.24.2 as the basis for conversion.
* Rename files (logs, config, executables) to use cback3 prefix rather than cback.
* Remove support for Windows and Cygwin, which was never advertised and rarely tested.
* Fix a variety of minor warnings from pylint 1.4.4, most of which also appeared in 2.24.2.
* Clean up manpages and add notes about migrating to version 3.
* Review user guide, fix broken links, make minor tweaks to wording, etc.
* Fix long-standing bugs with pre- and post-action hooks, ported from v2.24.4.