Add distance-based selections

[arose]

For example "within( 3, 12:A )" to select all atoms with 3 angstrom of residue number 12 in chain A. Depends on fast distance calculations (#76).

[martinjoel]

We would love to be able to use this selection option - any progress on this, or idea of timelines please?

[fredludlow]

Cheeky additional request: would it also be possible to reference other components? within(3.0, some_other_component_id).

The use case would be things like showing protein binding site surfaces for docking results / designed ligands etc., where the ligand and protein are in different files.

[arose]

Cheeky additional request: would it also be possible to reference other components? within(3.0, some_other_component_id).

this would be nice indeed, related #23

[arose]

sub-feature: option to update distance-based selection when playing trajectories

[tonyyzy]

Still looking forward to this so that distance-based selection can be used with the gui interface (http://nglviewer.org/ngl/) not just by using getAtomSetWithinSelection from JS side