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/which/which-uses-default-path

@@ -2,6 +2,3 @@ BUSYBOX=$(type -p busybox)
 SAVED_PATH=$PATH
 unset PATH
 $BUSYBOX which ls
-STATUS=$?
-export PATH=$SAVED_PATH
-return $STATUS