Add Links to Navigate between CMS User and CiviCRM Contact Screens

CiviCRM users would like an easy way to jump between a CMS User screen (e.g. "my account" in Drupal and the Edit User screen in Joomla) and the corresponding CiviCRM contact summary screen (civicrm/contact/view). For this revision, the links will be "2-way" for Drupal only (since we don't have hooks to modify the Edit User screen in Joomla currently). The code needs to be user_framework "aware" since the logic and links are different.

1. Conditionally include a "Go to User Screen" link on our Contact Summary template (Basic.tpl) to the right of the Edit, Delete, Vcard buttons.
1.1 This link is displayed IF the contact has a matching user record (e.g. a uf_match record pointing to a uid).
1.2 The link URL is $config->ufBaseUrl . 'user/' . $uid for Drupal sites
1.3 The link URL is $config->ufBaseUrl . 'option=com_users&task=editA&hidemainmenu=1&id=' . $uid for Mambo/Joomla

2. Conditionally include a "View Contact Record" link for Drupal my account (view mode) pages IF:
2.1 One or more profiles is included for User Account
2.2 There is a matching CiviCRM contact id in uf_match table for this user
2.3 The logged in user has "access CiviCRM" permission