CRM-15315 - in civicrm_group_roles_show_rules, fetch all groups, not just first 25 (D6 version).

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* CRM-15315: CiviGroup Roles Sync rules listing has blank groups
  https://issues.civicrm.org/jira/browse/CRM-15315
Merge pull request #163 from davejenx/CRM-15315-D6

CRM-15315 - in civicrm_group_roles_show_rules, fetch all groups, not jus...