Issue214 - Update sidebar layer tray to toggle raster layers like the control panel.

[lstillwe]

This update causes the sidebar layer tray to toggle raster layer visibility more like radio buttons.
This is how the raster layers are toggled in the control panel.

Please merge and remove branch on approval.

[PhillipsOwen]

i am seeing that layers on a model run are sorted (in reverse order) following a control panel advisory decrement.

[PhillipsOwen]

are the up/down buttons on each layer card redundant? they no longer seem to have a purpose in light of the new radio button like functionality.

[lstillwe]

i am seeing that layers on a model run are sorted (in reverse order) following a control panel advisory decrement.

i am seeing that layers on a model run are sorted (in reverse order) following a control panel advisory decrement.

I assume that was originally done so the last layer to be rendered was the one at the top of the defaultModelLayers array.

[lstillwe]

are the up/down buttons on each layer card redundant? they no longer seem to have a purpose in light of the new radio button like functionality.

are the up/down buttons on each layer card redundant? they no longer seem to have a purpose in light of the new radio button like functionality.

Probably. I consider this fix a temporary step - till issue #215 is done.