Revert "Add to plugin.info.txt: info about fork"

This reverts commit b96bb98c459e338a2ada264aba05937347bf7bc9.
Revert "Add to README: info about fork"

This reverts commit a2ec1a7901942665068ea9bdeb050b01bce0cfc7.
Revert "Fix in entry.php: Primitive "back to" link"

This reverts commit 40b1ae50dad41fd99f702b26384806584b5fa731.
Revert "Add to entry.php: Primitive "back to" link"

This reverts commit cefb97888230ebc99d511c926e171a58c8ff00fe.