STRIKEFORCE World Grand Prix Weigh-In Pics Photos: Esther Lin/STRIKEFORCE At the outset of the weigh-in Friday, it was announced that the next  two quarterfinal fights in the STRIKEFORCE World Grand Prix — Heavyweight Tournament would take place on Saturday, April 9.   Tomorrow/Saturday, Feb. 12, the STRIKEFORCE World Grand Prix begins live on SHOWTIME® (10 p.m. ET/PT,…