Pauline Astier hit up new Liberty player development coach Kristen Mann last month in preparation for the French point guard’s first WNBA training camp.  Astier and Mann go back about six years. Astier said she was only 19 when she and Mann were teammates for two seasons on the French club Tango Bourges Basket.  That familiarity has been a source of comfort for Astier as she readies for her WNBA debut .  “I know when I have one question, like, I can ask everybody but it’s easier for me to [ask Mann] because she knows me also, so it’s really easier,” Astier said Friday. “Before I came, I was like, ‘Please, can you send me the playbook, like everything.’ And she was like, ‘Don’t worry, you’re gonna be fine.’ So yeah, it’s nice to have her here.”  Astier, 24, is considered one of the best European guard prospects.…