Preserve core user search

Sorry, didn't finish my though: If you are using something like solr it is likely that your search does not work with users. This patch adds a checkbox to preserve core's search for users.

Unless I'm mistaken the section currently in the module:

<?php
  if (!empty($path)) {
    $search_forms = array('search_block_form', 'search_theme_form');
    if (in_array($form_id, $search_forms)) {
      $form['#submit'] = array('suppress_search_search_submit');
    }
  }

?>

will override all search forms even if the user tab is still there. In addition, I suspect many people will be looking to implement an alternative search will be using acquia powered solr (and as such most likely using acquia_search.module). This module overrides all search as well, including the user search.

What this patch does is provide a way for users to reclaim the user search box and reconnect it with core search. In order to make this work with acquia_search (and presumably most other modules that might form_alter the search form) we must bump up the module's weight in the system table so that it can form alter after acquia_search and restore the user search settings.

I have an additional patch that adds another user permission for search users so that it is possible to allow some roles to to view profiles but not to search for them and allow other roles to search, but that sort of doesn't seem like something that should live in this module really... Maybe it should be a core patch for D7 if it isn't already.