hush: fix '{ false; echo $?; }' bug.
hush: expand testsuite. variable expansion is still very broken

diff --git a/shell/hush_test/hush-bugs/quote2.tests b/shell/hush_test/hush-bugs/quote2.tests
new file mode 100755
index 0000000..bd966f3
--- /dev/null
+++ b/shell/hush_test/hush-bugs/quote2.tests
@@ -0,0 +1,2 @@
+a=1
+echo ">$a"