If its name sounds unconventional and a bit intriguing, readers of “Canned Salmon: Dialogues on the Common Goodwill” no doubt confirm those labels when they open this newly released e-book. Part social science textbook, part historical tract and part instructive handbook, “Canned Salmon” serves as a sort of contemporary manual for the alternative choices Americans who are young, old and in-between can make to live more fulfilling lives now and in the decades to come.