First I thought that this worked out, but now I had to return to starting point. It is not good idea to replace index.php with index.html that has redirection. Reason is that when somebody search, lets say this article:
it would give an error, because it needs /wp/index.php to redirect articles and pages that are linked under /wp/ folder to the right address. This article for example needs to be redirected here:
So my old hompage http://www.valokuvaamoklik.fi/wp -rederection needs to be handeled somehow in .htaccess.
I think this should be rather generic problem, so I think there should be an easy solution for this. PLEASE HELP :)