08-09-11 New design of plotting procedures from grid

Introduced a new check box for multiple selection of variables when making new charts. In the Output Sheet this option of picking variables will also be optionally linked to other open documents. This means that the same variable can be selected from multiple documents by one single click. The Click to produce the chart is still  a single click on any variable name. A single click on a specific variable will not make any chart if not a previous click already have been on the checkbox.