2.26.126: debugging ecl, upgrade, etc.
Don't key upgrade attempt on source-registry, since things can also change in the central-registry, etc. Also rename required-files to direct-dependency-files Improve the new convenience function pattern to work with operation initargs. Implement getcwd on all platforms. Actually catch sb-grovel messages. Tests: make u l=ecl instead of make test-upgrade lisp=ecl Tests: put the setup around the script, not inside; Tests: start using globals, much easier for debugging