Escape &'s in path name. Need to find general function for escaping all

shell metacharacters.

lib/dirspersist.zsh

@@ -5,7 +5,8 @@
 # Run dirpersiststore in ~/.zlogout
 
 dirpersiststore () {
-    dirs -p | sed 's/ /\\ /g;s/^/pushd -q /;1!G;h;$!d;' > ~/.zdirstore
+# FIXME: need to escape all shell metacharacters, not just spaces!
+    dirs -p | sed 's/ /\\ /g;s/&/\\&/;s/^/pushd -q /;1!G;h;$!d;' > ~/.zdirstore
 }
 
 dirpersistrestore () {