Removed broken multiprocessing code from seismic.wavefd
Removed broken multiprocessing code from seismic.wavefd

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