hush: fix escaping of \[*?; add testsuites for these and for globbing

diff --git a/shell/hush_test/hush-parsing/escape2.tests b/shell/hush_test/hush-parsing/escape2.tests
new file mode 100755
index 0000000..ee71801
--- /dev/null
+++ b/shell/hush_test/hush-parsing/escape2.tests
@@ -0,0 +1,4 @@
+echo "*?[a]*"
+echo a"*?[a]*"b
+echo '*?[a]*'
+echo c'*?[a]*'d