Refactor all.do and test.do in various directories.

Now 'redo test' runs the tests, but 'redo t' just builds the programs.

Also removed wvtest stuff; we're not really using it properly anyway and
it's not helping our testing right now.  It might come back later.

t/deps/test2.do

@@ -0,0 +1,8 @@
+rm -f t2.count
+redo t2
+redo t2
+OUT=$(cat t2.count | wc -l)
+if [ "$OUT" != 2 ]; then
+	echo "t2: expected 2"
+	exit 43
+fi