This spring, as Barcelona celebrates two of the 20th century’s most popular artists, its premier hotel wants guests to make a toast. The Hotel Arts Barcelona Picasso/Dalí Experience coincides with the nearby Museu Picasso’s highly anticipated Picasso/Dalí, Dalí/Picasso exhibit, which runs from March 19 through June 28. More than 80 works, compiled from 20-plus museums and private collectors, detail Picasso and Dalí’s deep appreciation for one another and the ways their longtime rivalry spurred both to greater …