functions.php: Fixed some mild errors.

functions.php: Fixed some mild errors.

    fetch_file_contents()
        using $updated when it was not defined - commented it out
    update_rss_feed_real()
        was also using $updated, undefined
        and had a inconsistent return, added return false;
    lookup_user_id($link, $user)
        was using $login for the SELECT not $user
    format_headline_subtoolbar()
        used $search_q before it was assigned to, re-ordered the code
    format_article()
        The 3rd arg "$feed_id" was never used in the function, it was set in the function
        Verified (and modified as needed) function calls in backend.php (5 Usages) and in modules/backend-rpc,php (1 usage)
    printTagCloud()
        Before ksort($tags) add a check for count($tags) == 0 return
    replace depreciated split() calls with explode()

backend.php

    replace depreciated split() calls with explode()

modules/backed-rpc.php

    replace depreciated split() calls with explode()
    in handle_rpc_request(), separate asort() from join(),  asort() does not return an array.
        This fixes a problem where a new tag is added to an entry, but doesn't show up after clicking on save. User must do a screen refresh.
        A PHP error msg was being returned in the JSON response.
.gitignore
    Make sure Mac OS X .DS_Store & PHPStorm project files (.idea/) are not included