Common Lisp library and executable for Delta Debugging

             (see [1] for information on Delta Debugging)

Implementation of the delta debugging algorithm from [2] in the Common
Lisp DELTA-DEBUG package.

The DELTA-DEBUG-EXE package compiles a command line executable which
minimizes either plain text files by line or patch files by diff.

Footnotes:
[1]  http://www.st.cs.uni-saarland.de/dd/

[2]  Zeller, Andreas, and Ralf Hildebrandt. "Simplifying and isolating
     failure-inducing input." Software Engineering, IEEE Transactions
     on 28.2 (2002): 183-200.