Vintage mode tweaks

Here are some features I miss from Vi, that i hope will come into vintage mode soon :-).

* If i press '*', it currently searches for other occurances of the word under the cursor. However, it does not currently highlight other occurances of the word, as vim does

* Hightlighting something with v, and pressing y, then highlighting another block and pressing p should paste the first block over the second block. This currently pastes it afterwards.