Test inserting Portlets in specific GridContainer columns

This page tests the inserting of Portlets into specific columns of the GridContainer. To do this, each Portlet must be assigned a "column" attribute, and the "isAutoOrganized" attribute of the GridContainer must be set to false.
-First Col, top
-First Col, middle
-First Col, bottom
-Second Col, top
-Third Col, top
-Third Col, bottom