The title of Fran Fabriczki’s debut novel, “Porcupines,” is taken from a parable from the German philosopher Arthur Schopenhauer in which porcupines cope with freezing weather by huddling together for warmth — only to be repelled by the pain inflicted by each other’s quills. It’s an apt metaphor for the challenges of relationships in the novel, as the protagonist’s strategy for getting through life is to keep others at bay, though she does so at a cost.