Check that all of the following work before a release:
* Runs under Python 2.5, 2.6 and 3.1 (after 2to3).
* Save
* Rewind
* Pastebin
* Pager
* Inspect source
* History
* Tab completion
* Argument inspection
* All keybinds
* All packaged themes
* Command line arguments correctly passed to scripts
* Delegate to standard Python appropriately
* GTK port (and, when implemented, all of the above for GTK port)
* Update CHANGELOG
* Update __version__