Moved the treeview into the #main-column area.
Handle updating #main-column without losing treeview.
Toggling Full-width treeview on now disables old treeview
- sets sidebar treeview to "search" tab
- disables "holdings tab
clearing blanks on newly loaded information objects
making the disabled tab look slightly more disabled
Toggling full-width treeview off triggers a complete page refresh.
No longer need to track state or handle "de-toggling".