Some improvements to Grosskurth redo

Alan Grosskurth's 2007 implementation of Daniel J. Bernstein's redo package was targetted at the Bourne Shell and was slightly simplistic. This package comprises modified versions of Grosskurth's original scripts, with the following improvements:

These modified shell scripts are not intended to provide the extra functionality of Avery Pennarun's Python scripts. Their target use is systems without Python, or without SQLite, and they provide the minimal necessary functionality for a working redo build system without extra things — not strictly necessary for the basic task of building — such as parallel building, complex search rules for .do files, debug trace capability, and redo-always.

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