FIX: prevent default mouse actions after picking
FIX: remove lone non-coil secondary structure after autoSS
FIX: PickingControls should not stop event propagation
DOC: simple hands-on example for selection language
CODE: add overall build script
DOC: mostly welcome and gallery pages
FIX: ignore connect records involving alternate locations (for now)
FIX: quoted atomname parsing
FIX: buildStructure: wrong program flow