Fidex errors with redirecting

You can use `is_jigoshop_single_page()` - please add constants for `VIEW_ORDER` and `CHANGE_PASSWORD` pages along with proper logic.

Moreover - you should extract logged in logic as it works for each and every page here, i.e.

```
$isViewOrder = is_jigoshop_single_page(JIGOSHOP_VIEW_ORDER);
$is...

if (($isViewOrder || $isEditAddress || $isChangePassword) && !is_user_logged_in()){ .. do redirect ... }
...

if ($isViewOrder) { ... specific rules .. }
```