Kill off the old 'tests' stuff. Write a ton of new tests for the

'testsuite' dir.  Fix a bunch of broken tests.  Fix the testsuite
'runtest' script so it actually reports all failures and provides
meaningful feedback.
 -Erik

testsuite/tar/tar-extracts-multiple-files

@@ -1,5 +1,6 @@
 touch foo bar
 tar cf foo.tar foo bar
 rm foo bar
-busybox tar xf foo.tar
+busybox tar -xf foo.tar
 test -f foo -a -f bar
+exit 99;