Feature/new search

Search form and search widget refactoring:
* Search results now persistant accross page reload. 
* Prepop search uses hard caching (week log) by query ID (hash of search data array). 
* Removed cache index build procedure on empty cache index
* To reindex website separate script should be used: **[reindex.php](https://gist.github.com/PavloKovalov/4ce05d5a38aa03a5dee1)**