Added test framework api for NST
Added track-best tests
Merge branch 'nst-testsuite' of https://github.com/nklein/cl-test-grid into nklein-nst-testsuite
re #17. tg-testsuites: improve the way ASDF systems of the NST project are loaded
re #17. README.org, status section: increase the number of libraries we considered and added to cl-test-grid
re #17. README.org: started the Credits section; recorded the Patrick Stein contributions.