Marvel’s ‘Thunderbolts’ opens the summer movie season with a solid $76 million box office debut

Marvel Studios’ “Thunderbolts" opened with $76 million in domestic ticket sales, according to studio estimates Sunday, kicking off the summer box office with a solid No. 1 debut that fell shy of Marvel’s more spectacular launches. All eyes had been on whether “Thunderbolts” — a team-up of antihero…