Implement some more functions for the complex type
Implement some more functions for the complex type

rust-num/num,rust-num/num-traits,DonSheddow/num,jbcrail/num,DonSheddow/num,anchovieshat/num,achanda/num,jbcrail/num,rust-lang/num,rust-num/num-integer,rust-num/num-integer,koverstreet/num,vks/num,anchovieshat/num,vks/num,rust-num/num,achanda/num,rust-num/num-bigint,rust-num/num-bigint,rust-num/num-traits,rust-lang/num,koverstreet/num