A QUICK LOOK AT JUSTIN JONES’S LATEST WORK, JIG (+Band), showing this weekend at the Bryant-Lake Bowl: A trio of dancers (Sam Johnson, Justin Jones, Hannah Kramer), dressed in dirty union suits with fur dickies, pile up on each other in shaky assemblages, brief multi-limbed creatures that unravel one into the next. Their hands reach up, in search of, then claw; they sniff and shiver volubly, then strike noble…