The 'one year is nothing' release

Yes, one year, almost to the minute. Same day of the same month, same hour.

The changelog, at least, is quite extensive:

• _bg allows running a command in the background.
• _fails allows a Command to fail even when option('-e') is on.
• Try program_name as program-name if the first failed the path lookup.
• Convert all arguments to commands to str().
• chdir() is an alias of cd().
• Capture is a class, not an arbitrary value.
• Updated doc.
• Fixed globals and local passed to the execution of the script.
• Fixed some fd leakage.
• Fixed redirection when _out and _err where Capture.
• Fixed keyword handling while doing our black magic.
• More, better unit tests!