implemented tutorial 03 in perl
implemented tutorial 04 in perl
implemented tutorial 05 in perl
implemented tutorial 06 in perl
implemented tutorial 07 in perl
implemented tutorial 08 in perl
implemented tutorial 09 in perl
implemented tutorial 10 in perl
implemented tutorial 11 in perl
implemented tutorial 12 in perl
implemented tutorial 13 in perl
implemented tutorial 14 in perl
implemented tutorial 15 in perl
change order of instructions in quaternion ops to match output order
faster perl implementation of quaternion math
higest accuracy PI for 32 bit perl
faster perl implementation
much faster PDL c implementation of quaternion rotation
refactored PDL quaternion rotation for brevity
implemented tutorial 16 in perl