+ Updated GroupsController so that GroupViewer (treeview) will only GroupTypes where ShowInNavigation=True.  In other words, now Families no longer show up in the TreeView
+ Update GroupTypeDetail with new ShowInNavigation checkbox
+ Update GroupMemberList to have a GroupId Block attribute so it can be used as a standlone block without a context (for example, CCV Residency).  Removed the Context attribute and instead just have the block directly read the PageParameters (in cases where the GroupId blockattribute is set to none)
+ Cleaned up some dead blocks
+ Updated BlockTypeDetail to make it easier to find out where BlockTypes are used