Karl-Anthony Towns called his own shot — in order to get better shots for those around him.  There has been so much written and said about the change the Knicks made with Towns, and the decision to play their offense through him as a facilitator from the elbows . It has been a central storyline of their unprecedented dominance through the first two rounds.  But how was that decision reached?  Towns claimed that when the Knicks trailed 2-1 in the first round against the Hawks, he went to the coaching staff and vouched for the change.  “You’re down 2-1, obviously it’s not the end of the world but you guys understand the importance of the next game. … You go in there and say how you feel, your feelings, your idea and see if it’s received,” Towns said after practice Friday. “And it was received.”  It certainly has been.…