1. Detect (and automatically handle) parasitic systems.
2. Each nix package has only one asd, and (almost) every parasitic
package inside it builds.
3. Ensure that parasitic systems are compiled.
4. Remove unnecessary testnames lisp override mechanism (the
testnae/testSystem is replaced by parasites/buildSystems).
5. Parasitic systems (if included in the system closure) become
aliases to their host package.
6. Support caching fasl files in a known directory (for faster
re-generation after modifying quicklisp-to-nix-system-info).
7. Eliminate unnecessary overrides. We're going to determine ALL
lisp dependencies correctly.
8. Don't try to "build" lisp packages with make. lispPackages should
be about bringing in a lisp library.
9. Eliminate the hand-maintained list of aliases. Parasites should
become aliases. Everything else should be a real package.
