Articles and online research provide only half the story. If you want to learn about European startups, dive into the deep end at tech conferences in Spain and Slovenia. — One company analyzes feet to eliminate the discomfort of ill-fitting shoes. Another has an interface to help Erasmus students find decent lodging. Yet another allows you to select the vegetables you want a farmer to grow, watch them via the internet, and, if you’d like, have a picnic there every…