t/*: rearrange tests into numbered directories.

It was getting way too ad-hoc in there.  Let's reorganize the tests so that
there's a good, obvious, suggested sequence to run them in.

t/200-shell/.gitignore

@@ -0,0 +1,2 @@
+/nonshelltest
+/chicken.vartest

t/200-shell/all.do

@@ -0,0 +1,2 @@
+redo nonshelltest shelltest vartest
+

t/200-shell/clean.do

@@ -0,0 +1 @@
+rm -f broken nonshelltest shellfile chicken.vartest *~ .*~

t/200-shell/default.vartest.do

@@ -0,0 +1,2 @@
+: ${PREFIX=not defined}
+echo "$PREFIX"

t/200-shell/nonshelltest.do

@@ -0,0 +1,3 @@
+#!/usr/bin/env perl
+$a="perly";
+print "hello $a world\n";

t/200-shell/shelltest.do

@@ -0,0 +1,10 @@
+set +e
+export SHELLTEST_QUIET=1
+cd ..
+( . ./shelltest.od )
+RV=$?
+case $RV in
+	40) exit 0 ;;
+	42) exit 0 ;;
+	*) exit 1 ;;
+esac

t/200-shell/vartest.do

@@ -0,0 +1,3 @@
+PREFIX=/a/b/c/d/e redo chicken.vartest
+read x <chicken.vartest
+[ "$x" = "/a/b/c/d/e" ] || exit 45