Provide option to disable context_links

Rerolled patch.

I can confirm this works as intended and indeed saves a humongous amount of node/add/% calls for each and every page load. The biggest problem for me personally was that this also happens for anonymous users who do not even have access to those pages!

I tried to improve this patch by adding an access check around this part:

  if (variable_get('context_display_context_links', TRUE) && ($context_links = context_links())) {
    $vars['context_links'] = theme('links', $context_links);
  }

but as this is all ctools (a module wich I've always failed to understand properly) I left it at that. My goal was to check if the user has access to the context admin links by means of a simple user_access('some permission here').

Bottom line again: this patch works as designed and fixes my problem as I do not need those links anyway.

mlc.

As 6.x-3.x version is no longer supported, please reopen the issue if you still need it in the supported versions (7.x-3.x and 8.x-4.x).