[1.20] Platon fixes for landing page

In addition to the attached files, change in template.php

function _platon_inject_css_override() {
if ($file = _platon_get_css_override_file()) {
$realpath = drupal_realpath($file->uri);
$path = str_replace($_SERVER['DOCUMENT_ROOT'].'/','',$realpath);
drupal_add_css($path, array('group' => CSS_THEME));
}
}

in order to have:

function _platon_inject_css_override() {
if ($file = _platon_get_css_override_file()) {
drupal_add_css($file->uri, array('group' => CSS_THEME));
}
}