Create a minimal UI to control display in NGL view

[josemduarte]

With NGL as the viewer it is now very easy to create some buttons to toggle visualisations. We need to decide what are important things to add. I'd propose:

• toggle side-chains as sticks in interfaces, can be per side of interface and/or per core and rim regions
• toggle potato view (entropy coloring on surface representation): this needs to be per chain displayed. So perhaps we need a drop down list since the number of chains can be quite large in assembly view
• toggle display of waters (as points) and ligands (as sticks)
• toggle coloring by subunits, symmetry mates, ...

Some more possibilities related to assembly displaying only:

• toggle display of engaged interfaces in 3D lattice graph
• toggle display of full 3D lattice graph
• toggle display of full unit cell

[josemduarte]

Another simple feature that we should have is displaying info for a residue upon left-click (residue number, residue type, chain id etc), similar to the default NGL UI, see http://arose.github.io/ngl/?example=3pqr

[josemduarte]

Something along the lines of this (but even simpler, just 3 or 4 toggle buttons) would do:

Screenshot is from the proteins plus service at Uni Hamburg: http://proteinsplus.zbh.uni-hamburg.de/pdb_files/search?name=1smt

[sbliven]

This would be very nice in 3.0, but it's not high priority.