harvester refactor: removed unused math import
harvester refactor: removed unused math import

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