#27 Select parent node(s) when child node is selected

[Anna Wojtowicz]

In the MOOSE Tree Viewer, when a parent node is unselected, all child node(s) down are automatically unselected.

Now we should enable the reverse operation: when a child node is selected, all parent node(s) up should be selected as well.

[Jordan Deyton]

I have a commit for this that I will push after a while after I've thoroughly tested it. Fortunately, this was brought to our attention, because I eliminated some redundant code, including two ICheckStateListeners that were stepping on each other's toes.

[Jordan Deyton]

This should be fixed now. It's nice to get to clean up some code and fix bugs at the same time!