neuronstagingarea.js: larger color seeds, an fixed a mild issue with pickColor
neuronstagingarea.js: replace tabs by spaces.
neuronstagingarea.js: use the requestQueue for loading skeletons,
which provides a waiting spinning wheel icon and plays nicer
with the rest of the application.
webglapp: cannot share meshes across renderer instances.
webglapp.js: fix incorrect destroy method definition for View.
WindowMaker: load skeletons from selection table when opening 3d view.
Refactored neuronstagingarea.js

Major effect: reduce memory footprint and loading time dramatically.

* create instances of Rapahel color wheel on the fly when needed. These
are very memory-heavy and take considerable time to create, noticeable
when adding hundreds of skeletons to the Selection Table.
* paginate Selection Table: only 20 skeletons listed maximum per page.
* renamed numerous methods for both conciseness and clarity of purpose
* Renamed "Properties" button to "P", for space
* Shorter neuron name by shortening the appened (Skeleton: ...) to #...
* Added an 'x' to remove all skeletons, with a confirmation dialog.
* Background color of selected skeleton is light green rather than yellow.
The light green matches the color of the active node in the canvas and
the 3d view.