Auto-redirect from non-mod-rewrite url becomes very unstable

We have invented new feature in 5.1.0 release. It works this way: when someone visits page using url like /index.php?env=... and mod-rewrite is turned on, then he got redirected to same page, but with correct mod-rewrited url.

Seems quite harmless, but lately it became quite a problem:

• unable to delete files uploaded via flash uploader (on front-end)
• I always got top menu instead of sub-menus (on front-end)

I propose we disable it for now and think about it some time later, but before 5.2.0 release.