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Let’s stop calling them films. The Brattle and Coolidge Corner, months after successful Kickstarter campaigns, have upgraded their projection systems to digital technology, meaning that every one of the Boston area’s first-run movie houses has made the conversion. The Brattle has even fashioned a DCP Debut repertory series, named after the format used to store digitally projected films. Running from Monday through the Fourth of July, it’s designed to “explore” the new technology. For years, these independent theaters have cultivated an audience through a steadfast commitment to film, but now they’re forced to sell us on the alternative. Yes, 35mm equipment does remain at the Brattle and the Coolidge, as well as at the Somerville Theatre. But the writing’s on the projection-booth wall.