v1.0 of bocchino/redo

This release is based on redo-0.11 of apenwarr/redo. It incorporates the following fixes and improvements:

1. Improved the installation procedure.

2. Fixed the problem of multiple inconsistent .redo directories.

3. Improved the behavior when running a .do script would clobber an existing directory.

4. Improved the error reporting when a remove or rename operation fails
   (e.g., when attempting to create a target in a directory that doesn't exist).

5. Added cycle detection, so that redo prints an error message and halts instead of hanging when it encounters a cyclic build dependence.

6. Added a command redo-remove for removing dependency informationabout a file. This is useful, for example, if a file gets marked as generated but you later decide you want to maintain it by hand.

7. Fixed bugs that caused spurious warnings about updated files on
   some systems.

8. Removed the deprecated "old-args" feature.

9. Refactored the code.