This adds the INDIVIDUALS view state to the memory panel, renames "dominator
tree display" to "label display", and adds a view for listing the individual
nodes in a census group and inspecting each nodes' retaining paths.
--HG--
rename : devtools/client/memory/actions/dominator-tree-display.js => devtools/client/memory/actions/label-display.js
rename : devtools/client/memory/reducers/dominator-tree-display.js => devtools/client/memory/reducers/label-display.js
