renamed restart
use goto-char point-min instead fo beginning-of-buffer
removed old keymap
switched overlay properies
removed start function
renamed to start-from-here
removed revy-unhide, revy-ubertex-numerize and revy-ubertex-unnumerize
fixed up revy-ubertex-slide-number
there is no need to goto the beginning as we can just specify the area to work on
removed outcommented code