Added utility function to calculate the norms of a list of vectors
Added utility function to calculate the norms of a list of vectors

fatiando/fatiando,mtb-za/fatiando,santis19/fatiando,rafaelmds/fatiando,drandykass/fatiando,cmeessen/fatiando,santis19/fatiando,mtb-za/fatiando,eusoubrasileiro/fatiando,eusoubrasileiro/fatiando_seismic,cmeessen/fatiando,eusoubrasileiro/fatiando,victortxa/fatiando,drandykass/fatiando,fatiando/fatiando,eusoubrasileiro/fatiando_seismic,rafaelmds/fatiando,eusoubrasileiro/fatiando,victortxa/fatiando