Polar motion matrix
W=CL_mod_polarMotionMatrix(xp,yp)
Builds a polar motion matrix from polar coordinates xp, yp
x polar coordinate [rad] (1xN)
y polar coordinate [rad] (1xN)
polar motion matrix (3x3xN)
CNES - DCT/SB
CL_mod_precessionMatrix
CL_mod_nutationMatrix