Configurable Search Access

you think you can squeeze that in for 0.2.0 :) ?

I didn't touch the mobile search link in the header.tpl, I thought there is a reason to show it on mobile, then it redirects to 403 if no `uid` or `allowGuestSearching !== '1'`, same behavior for the rest, except that on Desktop the search icon shows if search is allowed for guests, even if there isn't a `uid`
```
<li class="visible-xs">
    <a href="/search">[[global:header.search]]</a>
</li>
```

Also, had to hide/show the `#reconnect` icon now (along with opacity since this is handled in the theme.css), it was taking up space between the `#logged-in-menu` and the `#search-button` and looked awkward,