Imported sources from jeanluc's private braid project (braid:trunk/cbraid r447).
  * Updated GPL (renamed LICENSE).
  * Improve Makefile for programs.
  * Moved remaining .h files to include.
  * Updated CHANGELOG to reflect move to Google code.
  * Tiny INSTALL file.
Remove -fPIC compile flag.
Remove unused variables cur, current.
Updated CHANGELOG.
Updated CHANGELOG.
New code contributed by Maria Cumplido (student of Juan
González-Meneses).  Juan's description: The old code computed some
sets called Ultra Summit Sets, while the new one computes Sets of
Sliding Circuits (which are in general the same as above, but not
always).
Removed some unused variables in new code.
Added credit to Maria Cumplido in README.  Updated CHANGELOG.