CRM-12499 - CRM_Core_Permission_Base::translatePermission

CRM-12499 - CRM_Core_Permission_Base::translatePermission

Add helper function translatePermission which translates an expression like
"administer CiviCRM", "cms:view user account", or "drupal:access user
profiles" into something understood by native CMS.

Use translatePermission as part of check() in D6, D7, WP.

Use placeholder permssions ALWAYS_ALLOW_PERMISSION and
ALWAYS_DENY_PERMISSION for select corner cases.

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* CRM-12499: Allow users with 'access user profiles' to access $userRecordUrl
  http://issues.civicrm.org/jira/browse/CRM-12499