Run hook code in separate process

eval was little bit too much.

src/saturnin.sh.skel

@@ -323,7 +323,7 @@ saturnin__runhook() {
         warn "syntax errors, ignoring hook: $name"
         return 0
     }
-    eval "$code"
+    bash <<<"$code"
 }
 
 saturnin__runsc() {