Cedar-backup3

* Add optional size-limit configuration for amazons3 extension.

* Implement a new tool called cback-amazons3-sync.
* Add support for missing --diagnostics flag in cback-span script.

* Add new extension amazons3 as an optional replacement for the store action.
* Update user manual and INSTALL to clarify a few of the dependencies.
* Fix encryption unit test that started failing due to my new GPG key.

* Add eject-related kludges to work around observed behavior.
* New config option eject_delay, to slow down open/close
* Unlock tray with 'eject -i off' to handle potential problems

* Apply patches provided by Jan Medlock as Debian bugs.
* Fix typo in manpage (showed -s instead of -D)
* Support output from latest /usr/bin/split (' vs. `)

* Update CREDITS file to consistently credit all contributers.
* Minor tweaks based on PyLint analysis (mostly config changes).
* Make ISO image unit tests more robust in writersutiltests.py.
- Handle failures with unmount (wait 1 second and try again)
- Programmatically disable (and re-enable) the GNOME auto-mounter
* Implement configurable recursion for collect action.
- Update collect.py to handle recursion (patch by Zoran Bosnjak)
- Add new configuration item CollectDir.recursionLevel
- Update user manual to discuss new functionality