Add ability to select civicrm_relationship field contact_id_b as a View argument

In v. 3.0.1 (and all earlier versions probably) you cannot select the civicrm_relationship field contact_id_b as a View argument.

By applying this patch, you will expose the contact_id_b in the Drupal View UI if you create a view based on the civicrm_relationship table.

See Forum thread:

http://forum.civicrm.org/index.php/topic,8292.0.html

After applying this patch in this folder

civicrm/drupal/modules/views

to

civicrm.views.inc

be sure to clear your Views cache before creating the new View.