Added analytic signal to gravmag.fourier
Added analytic signal to gravmag.fourier

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