Cedar-backup3

* Fix minor formatting issues in manpages, pointed out by Debian lintian.
* Changes required to make code compatible with Python 2.7
- StreamHandler no longer accepts strm= argument (closes: 3079930)
- Modify logfile os.fdopen() to be explicit about read/write mode
- Fix tests that extract a tarfile twice (exposed by new error behavior)

* This is a cleanup release with no functional changes.
* Switch to minimum Python version of 2.5 (everyone should have it now).
- Make cback script more robust in the case of a bad interpreter version
- Change file headers, comments, manual, etc. to reference Python 2.5
- Convert to use staticmethod rather than x = staticmethod(x)
- Change interpreter checks in test.py, cli.py and span.py
- Remove Python 2.3-compatible versions of util.nullDevice() and util.Pipe
* Configure pylint and execute it against the entire codebase.
- Fix a variety of minor warnings and suggestions from pylint
- Move unit tests into testcase folder to avoid test.py naming conflict
* Remove "Translate [x:y] into [a:b]" debug message for uid/gid translation.
* Refactor out util.isRunningAsRoot() to replace scattered os.getuid() calls.
* Remove boilerplate comments "As with all of the ... " in config code.
* Refactor checkUnique() and parseCommaSeparatedString() from config to util.
* Add note in manual about intermittent problems with DVD writer soft links.

* Work around strange stderr file descriptor bugs discovered on Cygwin.
* Tweak expected results for tests that fail on Cygwin with Python 2.5.x.
* Set up command overrides properly so full test suite works on Debian.
* Add refresh_media_delay configuration option and related functionality.

* Add customization support, so Debian can use wodim and genisoimage.
* SF bug 2929447 - fix cback-span to only ask for media when needed
* SF bug 2929446 - add retry logic for writes in cback-span

* Fix a few typos in the CREDITS file.
* Update README to properly reference SourceForge site.
* Add <ignore_failures> option to peer configuration.

* Add support for the Python 2.6 interpreter.
- Use hashlib instead of deprecated sha module when available
- Use set type rather than deprecated sets.Set when available
- Use tarfile.format rather than deprecated tarfile.posix when available
- Fix testGenerateTarfile_002() so expectations match Python 2.6 results