Tests: run_regression_test.py now uses testfiles/AnvilWorld instead of the older alpha.tar.gz.
Tests: run_regression_test.py now uses testfiles/AnvilWorld instead of the older alpha.tar.gz.

session.lock is ignored when computing checksums.

Test checksums updated.

arruda/pymclevel,arruda/pymclevel,ahh2131/mchisel,mcedit/pymclevel,mcedit/pymclevel,ahh2131/mchisel