Revert "Add installation director for MathLAN"

This reverts commit 2f55bd6a0ec9cc9c1221ef2d752638fcf16d64bb.
Add a simple experiment.
Clean up Makefile
* Update path to Racket includes (a half day of debugging later ...)
* Add some installation commands
* Eliminate really old code (now unused), from the days when this was adbcr
* or some such