Rents are rising in places popular among tourists and in some areas of Spain, the shortage of affordable housing is so extreme that locals wind up living in caravans. Tens of thousands of people are joining protests demanding officials fix the situation. In the latest from the dpa trends & features desk, we hear from mayors trying to balance the needs of locals and the local economy. Allison Williamsdpa trends & features\———————– TOP FEATURE: When tourism is too much of a good thing: Spaniards are getting cross Hoards of tourists in narrow streets and public squares, causing hig…